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Found 115 results

  1. Item: 2 x Toroidal Transformers 160VA 2x20V Audio Grade Location: Sydney, Lindfield Price: SOLD Item Condition: Made in 2013 but never used, mint Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale a pair of Toroidal Transformers. They are 160VA, 2 x 20V each. Made by Toroidy, great Polish manufacturer of high quality audio grade transformers. Selling both matched transformers together, so the price is for the pair. They could be perfect for a dual-mono or two monoblock amplifiers. I bought the transformers 6 years ago, for my DIY amp that I never finished. I did not even put those transformers in. Stored them packed in the box. So these are pretty much brand new. I did not have time to finish that project and do not need those two any more, so the sale. Some of the characteristics of the Audio Grade transformers by Toroidy: - additional magnetic and electrostatic screening - epoxy filled centre with M6 clearance hole in a potted centre for mounting - gum pads to eliminate transmission of vibrations - impregnated core and the windings - covered with a black Mylar tape - production process scrupulously controlled at every step - quiet performance and the highest electrical parameters - flex leads - GOSS band On top of that, my order had a couple of custom modifications: - doubled diameter of secondary windings - primary winded on secondaries Specs: Primary: 0-230V @ 50Hz Secondaries: 20-0-20V Estimated dimensions: 105mm diameter x 50mm high (plus 10-20mm for leadouts) Mounting: M6 clearance hole in a potted centre Leadouts: approx. 110mm long flexible (stranded) Weight: approx. 1.35kg each I’m happy to post anywhere in Australia. Pickup available from Lindfield (2070). Photos:
  2. For the first time, I have a dedicated room for HT and Gaming and I have finally finished the acoustic treatment of the room. To create this space of 3.4 x 4.9 x 2.5 meter, I had to move the laundry, toilet and bathroom and knock some walls down. Yes…….. the missus really, really loves me. I had a look at soundproofing the room but decided to not go through with that idea, because the room was rather smallish to begin with and the build a bit complicated, with all the different walls and joist intersecting with each other and with the rest of the house. The room has a double brick outer wall with an air gap in between it, as the front and the right wall. The front wall also has a window in it behind the AT screen. The left wall is a solid double brick internal wall. The ceiling has a couple of 200mm exposed roof joist with some timber on top, 100mm insulation and a flat sheet metal roof. The back wall is newly constructed and is made out of 17mm plywood with 10mm gyprock on top, on both sides, with insulation in between. And the floor is a solid concrete slab. This room is rather solid and therefor rather challenging regarding bass issues. All treatment is DIY, and the total material cost for acoustic treatment is around $1100 AUD. The screen wall is a timber frame held up by corner (bass trapping) towers, resting on top of the floor boards, and locked into place by screwing it into the roof joists. It is sitting 550mm from the front wall and is basically functioning as one giant bass absorption trap with 50mm Autex High Density insulation. The wall around the screen has been finished with 6mm MDF sheets with a RPG binary pattern as a finish, and to bring some reflections back into the room. The area behind the AT screen is fully covered in insulation, except for the center speaker. The coverage of unexposed absorption of the front wall is roughly 60%. This improved clarity and sound stage a lot. It also helped with decay rates in the bass frequency. Enough to improve bass clarity, but not enough to even out the decay rate over the full LF frequency range. The bulk heads around the ceiling have been added on later and consist out of 10mm gyprock with more insulation behind them. The rest of the ceiling has been covered in a binary slat pattern that is hung from the 200mm exposed roof joist, and the space between the roof joist has been filled with more insulation again. The coverage of unexposed absorption on the ceiling is roughly 38% I found that this improved stage depth the most. The back of the room has been treated with panels made from the same 6mm MDF binary pattern and Autex insulation and have been mounted at various distances from the wall, 50-100-150mm. I had the mount one on a hinge as it was covering the door. I found this to be a big improvement in clarity and precision of tracking in sound effects. Thanks to clever placement of subwoofers and listen position I have been able to create a LF response for subs and full range front speakers, without any nulls and only need to cut off peaks to receive a flat SPL response. The frequency response of the decay times is less than flat due to the rooms solid build, but doesn’t kick in for the first 20ms, which isn’t too bad. All in all I am quite happy with the outcome, but isn’t my best work regarding finish, as I have favored speed instead of a quality finish.
  3. Just thought I'd put up my amplifier build. This amp was up and running around 6 months ago, but I've just put the final touch in it. Replaced my 1000va Nuvotem transformer to a Torroidy "Supreme audio grade" transformer. I'll post some pics of the process here. I have called this the "Zeus Audio - Simamp". I had some cast silver "Zeus Audio" name plates made for my Tsunami speakers so I thought to carry on the tradition with the other projects I build. Original speaker Logo. 3d printed wax, then cast in silver. Expensive logo. I started by reading the Bob Cordell book "Designing Audio Power Amplifiers". I produced a schematic using the best bits of the book. Decided to use a nice symetrical layout. Not because it sounds better, but because of my psychological tendancies. The amplifier was also tsimulated using the same "Ltspice" program learned by reading the book..and google. Voltage out (green). Power across 8ohm load (blue) simulated power acros 8ohm load Current though 8ohm load at max power before clipping. FFT plot @ max power 1000hz THD @max power 1000hz To be continued Cheers Simon
  4. For our October club meeting we are very pleased to have club member Bill Louey present his own highly modified home system including his DIY loudspeakers. Bill last presented his system to the club back in April 2012 – much of it has now changed and improved. Details of Bill’s system (details below were written by Bill)… Loudspeakers These are 3 way open baffle loudspeakers using dynamic drivers with active and passive hybrid crossovers. Open baffle loudspeakers have some unique advantages over conventional boxed speakers in that: · They don’t have an enclosed box so they have no box resonances hence no box colourations, · Their dipole radiation pattern reduces side reflections hence room interaction and increases the portion of direct sound over reflected sound in the room, and, · The first sound reflection from the wall comes from behind the speakers in the front instead of from behind the seat for conventional speakers, hence producing a more realistic, life-like sound. Open baffle loudspeakers are substantially harder to design due to sound wave cancellation, reduced efficiency and lobbing effects and usually require active crossover to shape frequency response and need multiple amplifiers to drive. Since open baffle speakers are much harder to sell manufacturers usually don’t make them, except with electrostatic loudspeakers. However, because of the greatest technical challenges and potentially the highest possible sonic result, open baffle speakers with dynamic drivers are the ultimate for loudspeaker DIY builders. Bill designed the crossover networks and has been tweaking them for 10 years now. He has only lately been very happy with the results and concluded the 10 year loudspeaker DIY project. CD/SACD/Blu Ray Source The source is a modified Marantz UD7007 universal player that plays CD, SACD and Blu Ray. Bill has undergone multiple revisions of his own upgrade over the years and has replaced hundreds of parts to change the player to suit his needs. He also changed the player from a Class II player to a Class I player in order to reduce the noise from the switch mode power supply unit. Preamp / Active Crossover This is a custom built unit designed by Bill to house the active crossover also to serve as a preamp. All buffer stages use OPA627 driven by an extremely quiet shunt regulator. Power Amplifiers Bill originally bought a DIY amplifier kit with conventional 3 stages, class AB, fully complimentary design. He later completely redesigned the printed circuit boards and incorporated a very quiet capacitor multiplier into the amplifier’s first two stages. He also designed his own very quiet and muscular power supply for the amplifier. These are MOSFET amplifiers rated 160W. The second half of the music sessions will be our popular BYO. Members and guests are welcome to offer music to share with us all. So bring along your favourite music on CD/SACD/Bluray (sorry, no vinyl this month). All we ask is that the music and recordings be interesting. We'll ask you to tell us a little about the artist/recording before it is played. Tracks over 6 minutes will be faded out, to give everyone a fair go. Whether you are a novice or a seasoned veteran, you will have the opportunity to listen, learn and share your experiences with others. Feel free to come and hear the capabilities of the system, or to just share the experience with like-minded music lovers in a friendly and relaxed atmosphere. Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound. Venue: Epping Creative Centre, Dence Park Address: 26 Stanley Road, Epping When: Sunday 13th October 2019 Doors open 1pm Meeting starts at 2pm Tom Waters President Sydney Audio Club W: http://www.sydneyaudioclub.org/ FB: https://www.facebook.com/sydneyaudioclub E: tomwaters@sydneyaudioclub.org.au
  5. Item: Location: Price: Item Condition: Reason for selling: Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Pictures: My room is 6.5m x 5.4m x 3m, and has a mode (a strong peak about +13dB in the frequency response) at 27Hz, as measured using REW with microphone at the listening position. I thought of cutting a piece of stormwater pipe to the 1/4 wavelength of this frequency (a piece about 3.2m), and blocking one end, and then loosely filling some of its length near the open end with sound absorbing material. The idea is that a 27Hz tuned resonator with energy absorption has been created. If the open end is placed close to the listening position, may be on the floor under the listening chair, will this reduce the severity of the 27Hz room mode? Help with comments please, may be this has been tried before.
  6. Hi Everyone, In this tread I will document details of my homemade turn table. As it’s already working I’ll upload pictures and details as interest dictates. Regards Mark
  7. Item: 2 x Toroidal Transformers 160VA 2x20V Audio Grade Location: Sydney, Lindfield Price: $200 (postage included) Item Condition: Made in 2013 but never used, mint Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale a pair of Toroidal Transformers. They are 160VA, 2 x 20V each. Made by Toroidy, great Polish manufacturer of high quality audio grade transformers. Selling both matched transformers together, so the price is for the pair. They could be perfect for a dual-mono or two monoblock amplifiers. I bought the transformers 6 years ago, for my DIY amp that I never finished. I did not even put those transformers in. Stored them packed in the box. So these are pretty much brand new. I did not have time to finish that project and do not need those two any more, so the sale. Some of the characteristics of the Audio Grade transformers by Toroidy: - additional magnetic and electrostatic screening - epoxy filled centre with M6 clearance hole in a potted centre for mounting - gum pads to eliminate transmission of vibrations - impregnated core and the windings - covered with a black Mylar tape - production process scrupulously controlled at every step - quiet performance and the highest electrical parameters - flex leads - GOSS band On top of that, my order had a couple of custom modifications: - doubled diameter of secondary windings - primary winded on secondaries Specs: Primary: 0-230V @ 50Hz Secondaries: 20-0-20V Estimated dimensions: 105mm diameter x 50mm high (plus 10-20mm for leadouts) Mounting: M6 clearance hole in a potted centre Leadouts: approx. 110mm long flexible (stranded) Weight: approx. 1.35kg each I’m happy to post anywhere in Australia. Pickup also available from either Sydney CBD or Lindfield (2070). Photos:
  8. Item: Elma Rotary 4 pole 24 way switch 04-4133 Location: Sydney, Lindfield (2070) Price: $200 (including postage) Item Condition: Brand new, never used Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale an Elma Rotary 4 pole 24 way switch (model 04-4133). Perfect for a High-End 2-channel ladder stepped attenuator. It comes with the stop pin. I bought it a couple of years ago from the hificollective in the UK to build a stepped attenuator for my DIY project. I could not find time to finish the project, so the sale. "High quality selector switch, non-magnetic bodied switch with 3 micron gold plated contacts over copper alloy. Ceramic wafer. Swiss made. Mounting hole 10.2mm, 6mm diameter shaft, 15mm shaft length body dimensions 76mm L x (32mm dia. x 25mm dia.). Make-before-break type. Superb for ladder stepped attenuators, balanced stereo stepped attenuators and stereo balanced TVC selector. Elma part number 04-4133." Pickup available from Lindfield (2070) or Sydney CBD, and I'm also happy to post anywhere in Australia. Photos:
  9. Item: Galaxy Maggiorato GX285 230 X 350 Mm 10mm Front Pane Location: Leichhardt, Sydney Price: $40 Item Condition: New not used, in box Reason for selling: Bought 2 used 1 Payment Method: Pickup only - Cash, Paypal Extra Info: Made in Italy about $150 landed new https://modushop.biz/site/index.php?route=product/product&path=119&product_id=747 Pictures: added a couple of one I made before...
  10. Item: Hypex NC502MP Class D stereo amplifier module Location: New Zealand Price: NZ$675 (firm) + freight. $25 donation to Stereonet on sale. Item Condition: New and unused Reason for selling: Bought for a project that didn't eventuate Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Unused top-of-the line Hypex NC502MP module https://www.hypex.nl/product/nc502mp-oem/77 This is rated at 500 watts into 4 ohms and 350 watts into 8 ohms, so will drive pretty much any pair of speakers on the planet. This module includes a matching integrated Hypex SMPS, so it really is a plug 'n' play option offering superb sound quality. Just BYO case (and a few other bits and pieces such as IEC inlet, input connectors, speaker binding posts etc). I suspect you'd need to spend at least $3k - and probably more - to get anything close to comparable sound quality. From the Hypex website: The NC502MP amplifier module incorporates a low power standby power supply (meets 2013 ERP Lot 6 0.5W requirements), a highly efficient switch mode power supply and a high-performance Class D amplifier in one compact and easily applicable power brick. The amplifier used in the NC502MP is a self-contained high-performance class D amplifier intended for a wide range of audio applications, ranging from public address systems to ultrahigh-fidelity replay systems for studio and home use. Chief distinguishing features are flat frequency response irrespective of load impedance, nearly frequency independent distortion behaviour and very low radiated and conducted EMI. Control is based on a phase shift controlled self-oscillating loop taking feedback only at the speaker output. The main SMPS providing the power for the amplifier is a compact, high power, highly efficient, regulated half bridge converter with synchronous rectification on the main output rails. These properties make this technology ideal for powering Class D audio amplifiers. For applications requiring a standby mode, a low power standby SMPS also has been integrated into this product. To achieve universal mains input compatibility this SMPS features an automatic input voltage doubler. Link to Datasheet here: https://www.hypex.nl/img/upload/doc/ncore_mp/nc502mp/Documentation/NC502MP_02xx_03xx.pdf Pictures:
  11. I started collecting the parts last year. I just finished the woofer bins this past month. The woofer boxes are based on a vintage Jbl design using jbl 225h 15 inch woofers. The mid horns are Altec 511b, the upper mid horns are Yamaha pro and the tweeters are Jbl. The 511b uses a Warfedale pro driver. The rest are Jbl. I forget the numbers. I gave the Altec 511b to my son as a thankyou for finding my current speakers Speakerlab K horns vintage 1971. Made in Seattle Wa. Thanks, Richard,L.
  12. I've been planning to build a new 3-way pair from scratch for some time and it's finally happening. The last upgrade I did on my main speakers was to increase the box size from 70 to 118 litres by adding plinths to the bottom of the existing enclosures, replacing the 10" bass drivers with 12" Peerless 830669's, fitting appropriate ports and rebuilding the crossovers. I've been really happy with the results, but always planned to upgrade the aging mids & tweeters and build new enclosures from scratch with better materials and a really nice finish. I've been really happy with the Peerless woofers, so they are being re-used. Did quite a bit of research into mids & tweeters that would match with the 830669s and with each other, and finally settled on SB Acoustics SB15NRXC30-4 5" Mid-Bass drivers and SB26ADC-C000-4 Tweeters. They're both a very good match for the woofer in efficiency and both have really good off-axis response in the bands they will be operating in. I also picked the SB15NRXC30-4 because it has an Fs of 41 Hz. This allows me to have a fairly low woofer-mid crossover of 350Hz, so that each of the 3 drivers will only be responsible for about 3 to 4 octaves. I'm looking at a mid-tweeter crossover of 2800Hz, so all 3 drivers will only be operating well within their comfort zone. The new enclosure will be 130L front-ported and the midrange driver will have its own 3L chamber behind it that I'm making up out of heavily damped poly pipe. I don't really have the time or tools to build the boxes as well as I would like, so have got a custom furniture builder doing it for me. Should be picking up the semi-assembled boxes soon to do the internal treatments.
  13. Item: 2 x Toroidal Transformers 160VA 2x20V Audio Grade Location: Sydney, Lindfield Price: $200 (postage included) Item Condition: Made in 2013 but never used, mint Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale a pair of Toroidal Transformers. They are 160VA, 2 x 20V each. Made by Toroidy, great Polish manufacturer of high quality audio grade transformers. Selling both matched transformers together, so the price is for the pair. They could be perfect for a dual-mono or two monoblock amplifiers. I bought the transformers 5 years ago, for my DIY amp that I never finished. I did not even put those transformers in. Stored them packed in the box. So these are pretty much brand new. I did not have time to finish that project and do not need those two any more, so the sale. Some of the characteristics of the Audio Grade transformers by Toroidy: - additional magnetic and electrostatic screening - epoxy filled centre with M6 clearance hole in a potted centre for mounting - gum pads to eliminate transmission of vibrations - impregnated core and the windings - covered with a black Mylar tape - production process scrupulously controlled at every step - quiet performance and the highest electrical parameters - flex leads - GOSS band On top of that, my order had a couple of custom modifications: - doubled diameter of secondary windings - primary winded on secondaries Specs: Primary: 0-230V @ 50Hz Secondaries: 20-0-20V Estimated dimensions: 105mm diameter x 50mm high (plus 10-20mm for leadouts) Mounting: M6 clearance hole in a potted centre Leadouts: approx. 110mm long flexible (stranded) Weight: approx. 1.35kg each I’m happy to post anywhere in Australia. Pickup also available from either Sydney CBD or Lindfield (2070). Pictures:
  14. Item: Elma Rotary 4 pole 24 way switch 04-4133 Location: Sydney, Lindfield (2070) Price: $200 (including postage) Item Condition: Brand new, never used Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale an Elma Rotary 4 pole 24 way switch (model 04-4133). Perfect for a High-End 2-channel ladder stepped attenuator. It comes with the stop pin. I bought it a couple of years ago from the hificollective in the UK to build a stepped attenuator for my DIY project. I could not find time to finish the project, so the sale. "High quality selector switch, non-magnetic bodied switch with 3 micron gold plated contacts over copper alloy. Ceramic wafer. Swiss made. Mounting hole 10.2mm, 6mm diameter shaft, 15mm shaft length body dimensions 76mm L x (32mm dia. x 25mm dia.). Make-before-break type. Superb for ladder stepped attenuators, balanced stereo stepped attenuators and stereo balanced TVC selector. Elma part number 04-4133." Pickup available from Lindfield (2070) or Sydney CBD, and I'm also happy to post anywhere in Australia. Pictures:
  15. Item: New Wilson Audio Woofer, 8" Location: ACT Price: $1500 Item Condition: 10/10 Reason for selling: Not needed... Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Bought these brand new from JS Audio, Bethesda while I was living in the states in order to upgrade my Wilson Speakers (WP6). Events get in the way, the WPs moved on and these must also move on. Believe these are Wilson badged Scanspeak. Genuine, new, brilliant. Pictures:
  16. Item: Parts for DIY amp, toroidal transformers, chipamp, Elma switch for stepped attenuator, Jantzen caps etc Location: Sydney CBD or Lindfield (2070) Price: See the list below Item Condition: See the list below Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal, eBay buy it know also available Extra Info: As I don’t have time to play with DIY audio anymore, I decided to part with some of the components that I have collected over the last few of years. 1. Gainclone Chipamp LM3875 amplifier with Alps pot, Caddock resitors, Mundorf and Philips caps, CMC sockets, MUR860G ractifier diodes Price: $160 $80 including postage Condition: Brand new, never used eBay link: https://www.ebay.com.au/itm/232941927933 2. Elma Rotary 4 pole 24 way switch 04-4133 for High-End ladder stepped attenuator Price: $220 including postage Condition: Brand new, never used eBay link: https://www.ebay.com.au/itm/232940569003 3. 2 x Toroidal Transformers 160VA 2x20V Audio Grade Custom Build Price: $220 for a pair - including postage Condition: Brand new, never used eBay link: https://www.ebay.com.au/itm/232940653943 4. 2 x Toroidal Transformer 300VA 2x20V Audio Grade Custom Build Price: $150 each - including postage Condition: Mint. I have it installed in the amp prototype for the last couple of years, but not used it that much. eBay link: https://www.ebay.com.au/itm/232941929049, https://www.ebay.com.au/itm/232941929771 5. Pair of Jantzen Audio Superior Z-Cap 2.2uF 2% 800Vdc capacitors Price: $60 for a pair - including postage Condition: Brand new, never used eBay link: https://www.ebay.com.au/itm/232941942895 For more details please check eBay links or send me a message. I’m happy to post anywhere in Australia. Pickup also available from either Sydney CBD or Lindfield (2070). Pictures: Note: the last image shows the prototype I built. From the list above, only the pair of 300VA transformers were installed in that prototype. The rest are brand new parts.
  17. Item: WBT 0110 CU RCA connectors X 4 Location: Sydney West 2190 Price: $115 Item Condition: Good Reason for selling: NLR Payment Method: Pickup - Cash, Paypal (+3%), COD Only Extra Info: Up for sale is 4 x WBT 0110 Cu RCA connectors, 2 in white and 2 in red colour. bought and used for DIY project but no longer need, all in good working order, cosmetic condition please refer to photos. I don't have the original package, pick up welcome or can be post. Details link: https://www.wbt.de/english/products/a/Detailansicht/Artikel/nextgenTM-rca-connector-topline.html Pictures:
  18. Hey guys just found this site, what a wealth of knowledge i've stumbled across! Hoping for some advice for a floorstander on a $500 budget? Tight bass from 40hz upwards is important. Second hand or diy kit (quite handy) ideas prefered. Would like to listen to music (all genres) with no sub at medium volume in a medium sized room. Currently have Orphues Aurora 1 bookshelves which are amazing but bottom out at about 80hz, will move them to the rear. Sony str-dg700 amp, only 100 watts so floorstander needs reasonable sensitivity. Elac debut 2.0 c5.2 centre speaker (great but find their towers in my price range low on bass) Old Marantz sub (little boomy buy goes low will use for 20-60hz on movies only) Anyone got anything suitable they want to move in Sydney? Or can highly reccomend a diy kit or something they saw for sale? I know i should go listen but i cant really compare in my situation and no point buying new considering 500 budget. Also please dont say save more for etc. etc. my ball and chains happyness and therefor my sanity requires $500 only. Cheers for your help and understanding, Nick
  19. Saw these on the fourm for 700$. Would they be suitable? If so would offering 500 be insulting? See below post for siuation, thanks!
  20. Hi, I just joined SNA to see if anyone has any suggestions on how to correctly re-wire front speakers to match a low-powered retro 1970s pre-Optonica Sharp 4 channel Radiogram GS-9200. Posted in the new member's section & djb (after asking why not offload it to a hipster store ) suggested I post here - is this the correct forum? I do not have the original speakers for this system & want to try re-wiring speakers that suit a different 4 channel amp (from the same era). The front speaker connections indicate that the original Sharp 'Golden Sound' speakers were unusual - had a plug with four prongs, three active with three-core lead cable to the original, I think the 1st lead to high (+), 2nd lead to low (+), 3rd lead to common (-). At this link, the photo on the bottom right shows the rear of a very similar mode - see three lead cable at top right of unit: http://forum.audio.com.pl/vintage-sharp-golden-sound-GS-8200A-t29840.html I am not overly familiar with speaker cables - previously have only had 'standard' sound systems with twin-core lead e.g. red/black to the speaker, or two twin-core flex for 'bi-amped' jobs e.g. red/black to woofer, blue/grey to tweeter. Anyone ever encountered anything like this? Would the cross-over arrangement be different to usual? I don't have the service manual or even operating instructions for this model but I'm hoping the schematics on the links below (for slightly different models) might provide some clues. I can do some trial and error with some 3-way floor-standing speakers of the same era/ quality (Sanyo) which may be suitable, if the speakers are low-rated enough to suit the Sharp receiver. Would using a multimeter assist with determining correct wattage/ impedance ( I really have no idea)? Other forum postings with images, schematics for other Sharp models, which raise similar issues: At Stereonet: http://www.stereo.ne...ing-to-his-amp/ See also QuadraphonicQuad: http://www.quadrapho...ker-Connections And Audiokarma: http://www.audiokarm...p/t-268190.html If anyone has any pointers I'd be much obliged. Tangio tumas, SoloOlo
  21. Item: 80W (160W peaks) DIY Chip and tube Hybrid power amp Location: Langwarrin Price: $550 + postage ($38 to most capital cities). At this price with donation to SNA Item Condition: AS new 9.5/10 Reason for selling: More DIY amps on the way Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: A powerful clean sounding fast hybrid amp. Two TDA7294 high performance power chips 6N3 preamp\driver tube One new additional 6N3 tube with the sale Over-size toroid power tranni Single board construction so very short signal path Robust power supply onboard Crowbar speaker protection and over volts and current monitoring Quiet on Large heat sinks with on chip thermal monitoring Three selectable RCA inputs RFI\EMI power filter Professional finished (19" 2U) steel damped enclosure Alps Blue Velvet pot with gold plated 4oz solid brass knob Gold plated solid brass three-way speaker binding posts Captive power cord for secure mains connection Enclosure is earth and fused Separate high current filament power tranni Fine silver plated hookup wire in the signal path All WBT silver soldered Shock mounted cct. brd. http://retro-thermionic.blogspot.com.au/2013/09/number-9-tube-and-chip-80w-integrated.html ELECTRICAL DISCLAIMER This product has not been manufactured by a qualified individual or company, therefore contains electrical circuits that do not necessarily comply with Australian Standards. I understand that as the seller, I may be liable to repercussions in the event of equipment failure. By advertising and selling this product, as the seller I also agree that I am solely liable, and the publisher of this website takes no responsibility for any injury or death resulting from, whether directly or indirectly, any accident that may happen as a result of the failure of the product being sold. If in doubt, seek the services of a qualified electrician to inspect the product to ensure it is safe for use. Pictures:
  22. I am building 4 way active speakers and need a 8 channel power amp to run each driver separately. Any recommendation? they will need to handle a 4 Ohm load. Drivers are as follows: Upper Bass - ScanSpeak 22W/8851T-00 8"Revelator Woofer - 8 Ohm Midrange - ScanSpeak 12MU/8731T-00, 4" Illuminator Midrange Tweeter - ScanSpeak D2908/7140 Beryllium Dome Revelator Tweeter - 8 Ohm Midrange – Another 12MU/8731T-00 wired in Parallel with the one above (MTM) 4 Ohm (8 Ohm in parallel) Lower Bass - ScanSpeak 32W/4878T Revelator 13" Subwoofer - 4 Ohm
  23. I'm not sure if this is DIY section, computer section, or power / cables / electronics post, so I've plonked it here but it would fit elsewhere as well: I have been using older TP-Link AV200 "powerline" adapters for some years with great success to provide network access to a few locations where it was difficult or inconvenient to do it with wifi - although slow, they have been fast enough for the purpose at hand, and much more reliable than wifi. But the units have eventually failed after a few years, I think they run fairly hot despite their low power use, and perhaps in the garage on hot days they ran too hot which has accelerated their demise. So I purchased some newer TP-Link AV600 units to replace them - and they work great, even faster speed. BUT - I noticed a high pitched snarling, hissing sound in the left (but not so much right?) high frequency driver of my high efficiency, active crossover stereo system. The left tweeter is closest to the PC, although they are isolated from the playback system the cables do run close to the speaker wire. Unplugging the AV600 units and my system went back to its usual near silence. I haven't done any problem solving or tried re-arranging things yet, just interesting to report this - though not surprising that a networking system that works by injecting a signal into the mains electricity causes such audible issues. I did not have this issue with the older AV200 units. Or at least not audible to me.
  24. DIY Night 8pm Wednesday 13th December, visitors welcome. Willis Room, City of Whitehorse Offices Maroondah Highway (Whitehorse Road), Nunawading Melway Map 48 Ref G9 Contact: 9437 1249 It's that time of year again when the DIY group get to show off their Hi Fi projects at the December General Meeting. It looks like another busy year for the group as they have managed to put together three systems for the night's presentation. This year we are lucky to have a wide range of equipment on show, everything from vinyl to a music server, and both Class-D and Valve amplification. The Audio Action group will be demonstrating their finished project, a Phono Preamp designed and built by a team of MAC members. The first system will be playing music from a DIY "Raspberry Pi" music server. Based on a low cost but very powerful computer board aimed at the educational department. This same system will feature a 250W Class D amplifier powering a pair of 2-way stand mount speakers. The second system will showcase the MAC Phono Preamp, designed with two 'best in class' head-stage amplifiers, one for MC and one for MM cartridges. The rest of the system will have an opamp based preamp running into another Class-D power amp. A pair of 3-way speakers with American 12" bass drivers, Scandinavian 5"mid's and 'Raal' ribbon tweeters, will be providing the sound for the night. The final system will feature a valve amplifier with a modest 15 Watts. The design is a hybrid of Dynaudio ST70 and Alan Wright's ideas using EL34's in ultra-linear mode. The amp will be partnered with equipment from the other two systems. As in previous years, each system will be allotted 30 minutes. Each presenter will get to explain their gear as well as play some music. This should see us finish the session by 10:00pm, allowing the members on the night to hear all the systems. Its going to be a cracker of a night. Nick Karayanis Program Co-ordinator Ken Tripp Wise and Wonderful Webmaster Melbourne Audio Club, Inc. http://www.melbourneaudioclub.org.au
  25. Item: Three-way Bipolar, large floor standers Location: Sydney Price: $600 (or near offer - see notes) Item Condition: good, used, DIY project Reason for selling: that's what I do after each build. Too many speakers already. Payment Method: Cash, Bank Deposit, Paypal Extra Info: These are my latest build, my hobby, not for profit. I’ve tried out a new look, and a bipolar arrangement with one midrange facing forward (Marantz) and an oval one facing backwards (Magnavox). Sitting above these is a little silk dome tweeter in a custom-made housing. I’ve written for Sound & Image magazine on speakers that radiate forward and aft, and I have a number of speakers that do just that, or even a full 360 degrees. The bipolar or omni effect adds to soundstage depth and overall spaciousness. The 12” woofer is housed in its own rear-vented 100 litre enclosure, and the bass response is down to 40Hz, not sure where it peters out exactly but there’s nothing much happening at 30Hz. My test tone disc offers 30 and 40, but nothing in between! Anyway, to go below 40Hz in a new speaker these days you’re probably looking at the best part of three thousand. These work well with jazz, classical, popular and I’ve even tried a bit of dance/trance to good effect – Infected Mushroom’s BP Empire gives a good workout. You might get more bass with a Peerless or some other woofer, but it would most likely add $200+ to the price. Cosmetics are imperfect. Some might say rough! I do the best I can with the rough and ready home workshop setup, but I have to admit there are numerous flaws. My stuff will never look shop-bought, however they look impressive enough, and the sound is the main event. I try to achieve a level of detail that’s lifelike but not edgy or stressful. Combine this with a fairly full frequency range and you have an enjoyable experience. I only make one of each model, so every pair I make is a one-off. The top boxes will be attached with tiny silver brackets but I haven't fixed those at the time of writing as I was still playing with some resistors to balance the mid and top end reponse vis a vis the woofer. I'm working in a room which is on the live side, one with more drapes or bookshelves, soft furnishings etc will alter the end result a bit, changing the treble/bass balance. Bass loading varies quite a bit from room to room anyway. This room is bass light if anything. Dimensions etc: the bass boxes stand 860x480x340mm approx., while the top housing adds a further 140mm plus 60mm for the tweeter, for an overall height of 1060mm. Impedance at rest is 7.5 ohms. I’m guessing about efficiency, probably in the 88-90dB area. They are biwirable, but this will make little difference unless you bi-amp. (The design is in part inspired by the Technics SB-7000) Price: make an offer. My asking price includes delivery by me in the Sydney area. Since I can’t offer a demo here at my place, we can do that at your place, but a charge will apply if not purchased. Delivery: Depends where you are. I’m fairly flexible about home delivery in the Sydney area. Difficult to pack and send, but ask me about that anyway. There may be a way, if the right packing materials can be found. Pictures:
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