Jump to content

Sign in to follow this  
brunoaudio

A new amp in the making...

Recommended Posts

Hi all 

 

i am making a new pair of monoblock ampllfiers using nos brimar 6v6g,s in pushpull for the power,in the phase and preamp i am using nos russian 6sn7s with gold grids and british ef37a. the design is based off the leak TL12.1 instead of using a gz34 for rectifer i am using a lower powered rusian version of the gz34 mainly because of the cost. the 6v6 is in the 6l6 6f6 family and because the 6f6 is a kt66 by running the cathode ristors a bit lower and a number of other changes i can use a 6v6. the output transformers are the 20 watt altronics line transformers that i have talked about here 

and for power transformers i am going to use the beacon R08 its about 300 volts a side it might be a bit more i might use a choke but they will need to be a decent size and i don't have a decent size pair.

 

thanks

Bruno 

 

 

Share this post


Link to post
Share on other sites

 

It will be interesting to see what the total cost is when you're finished.

Share this post


Link to post
Share on other sites
1 hour ago, LogicprObe1553552783 said:

 

It will be interesting to see what the total cost is when you're finished.

the power and output transformers are being gifted by my papa the 6v6g x4 i got i a bulk lot of valves for quite cheap i traded a nos made in japan gz34 and a few other valves to my dads friend for a quad of russian lower powered gz34 valves and 3 blackburn mullard rebranded ef37a that are nos.my papa imports quite a few valves from russia including the gu50 valves with 12.6 volt heaters that are like a high power 6l6gc , the russian 6sn7 are decent sounding and cost about $7.00 nzd each. my istermated cost in parts is about 130.00 NZD max more like 200.00 including transformers.

 

 

Thank you for reading

Bruno

Edited by brunoaudio

Share this post


Link to post
Share on other sites

Hi all

 

i am in the schamatic stage now. the website tunner audio http://www.turneraudio.com.au/leakampmods.htm has a decent schamatic for the tl12.1 my dads  very good  audio friend who is the tecnichin for two hifi stores in chch has been helping my and me and my  dad with the amp a few changes will be made to the schamatic to be able to use  the 6v6g in the output power stage and a few other changes. in the future i am planing to make a clone of the the macintosh c22 valve preamp using the 6n2p the rushin version of the 12ax7 with a diffrent pinout.

 

 

Thanks for reading 

Bruno

Edited by brunoaudio

Share this post


Link to post
Share on other sites


Hi all 

 

Update:

 

The cabinets are being made now using rimu and vintage brass round head screws sheet metal on the top painted matt black and bottom with a air vent added. 

 

Will try to post some pics soon.

 

 

 

 

Thanks for reading 

Bruno

Share this post


Link to post
Share on other sites

 

I'm looking forward to seeing it.

Share this post


Link to post
Share on other sites
13 hours ago, LogicprObe1553552783 said:

 

I'm looking forward to seeing it.

Thanks mate.

 

Im going to get the moddifed schamatic printed out at school in a3 then try to make antoher copy by hand with the changes for the 6v6 and other things. 

 

Thank you LogicprObe for the kind surport on my project.

It makes me very happy that someone is being kind to me and responding to this.

 

Bruno

Share this post


Link to post
Share on other sites


 Hi all 

 

I need a bit of help with the amp, so a few days ago i looked at my papas pair of tl12  [el84 ecc81 ef86] version and drawed out the backilight phonocic board in to my book but it is a slighty diffrent schamatic so i was wondring if anyone here would be able to take a picture of the underside of there tl12.1 [kt66 6sn7 ef36 gz32] to compere my papas amplifer. its a big ask but i am having a bit of trouble trying to find a pic of the underside of one. the next step is to asemble the chassie and make the main phonolic tag board.

 

Thanks for all the surport on the project, 

Bruno

Share this post


Link to post
Share on other sites

Now thinking of putting the amp in to a 4u  inch rack mount case that i have its quite solidly made and might bulid in something like the Nelson Pass b1 buffer in to it. this project will be ready in about 3 mouths at most due to a big electronic comp i am doing called ASB BRIGHTSPARKS so sorry about that.

 

Thanks,

Bruno

Edited by brunoaudio

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Raffinator
      Item: Vincent Audio SP-T700 Monoblock Amps (silver)
      Location: Forestville NSW
      Price: $2,200 pair
      Item Condition: Very good. 2 years old
      Reason for selling: NLR
      Payment Method: Pickup - Cash, Paypal
      Extra Info: For sale are my pair of Vincent Audio SP-T700 Hybrid Monoblock amplifiers in silver. I am the original owner, and they are 2 years old. Selling due to a change of configuration.
       
      See https://www.vincent-tac.de/en/product-lines/tubeline/sp-t700.html for full details.
       
      See https://funaudio.com.au/brands/vincent/ for link to current importer.
       
      I have the original boxes in good condition, and I'm willing to ship at the buyer's expense. 16kg each in two cartons.
       
      Photos: 




    • By SHF Staff
      Item: Parasound JC1(pair)
      Location: Sydney Hi-Fi Castle Hill Shop 7/19 Victoria Avenue Castle Hill, NSW
      Price: $8,000
      Item Condition: used in very good condition
      Reason for selling: Trade In
      Payment Method: Pickup - Cash, Paypal, Cards
      Extra Info:
      Recently traded Mono's in excellent condition and a steal at this price!
       
      Parasound JC 1 Key Features;
      Premier monaural amplifier Circuitry designed by legendary John Curl and CTC Builder Ultra-high bias Class A/AB operation Exclusive two position bias level adjustment Balanced inputs with discrete circuits and XLR connectors Vampire Direct gold-plated OFC RCA input Dual heavy-duty 24k gold-plated 5-way speaker binding posts Direct Coupled – no capacitors or inductors in signal path Complementary MOSFET driver stage and JFET input stage 18 beta-matched 15 amp, 60 MHz bipolar output transistors 1.9 kVA encapsulated toroid power transformer Independent power supplies for input, driver and output stages 18,000 μF filters for driver stage 132,000 µF Nichicon Gold Tune filters for output stage DC Servo and relay protection circuits REL and Nichicon Muse capacitors Harris hyper-fast soft recovery diodes for all bridge rectifiers Auto turn-on by 12v trigger or audio signal trigger Ground lift switch , adjustable turn-on delay 4u Chassis with rear carry handles, rack mounting kit included THX Ultra2 certified Continuous power output, 20Hz – 20 kHz:
      400 watts RMS x 1, 8 Ω
      800 watts RMS x 1, 4 Ω
      1200 watts RMS x 1, 2 Ω
      Class A power output, 20Hz – 20 kHz:
      25 watts, bias set to high, 8 Ω
      10 watts, bias set to low, 8 Ω
      Dimensions WHD = 432 X 178 X 508 each
      Weight 29.1kg each

       
      Pictures:
       
       



    • By AdamR
      Been agonizing over posting this here or not. The world is full of EL84 amplifiers - who needs to see another one? I built this for two reasons: To have a tube amp to use while I refurbished my old one, and to have a unit I could surprise people with when they learned what 15 watts per channel can do.
       
      Had a lot of fun designing and fabricating the PCBs, punching, drilling, CNC milling and laser-etching the chassis, soldering and testing... this one took about a month of evenings and weekends and represents an investment of $1400 NZ
       

       
      It's the best-looking one I've made so far, and the fastest turnaround. 
       

       
      Technical and performance details, schematic, and more photos here.
       
      One of these days I'll make something that doesn't look like such a rats' nest inside. 
       
      The Silicon Centipede is the microcontroller for the remote control... the RC allows remote power switching, input selection and volume control (motor driven).
       
      This thing's been pleasing us with its performance and surprising amount of authority it exerts over the fairly inefficient KEF speakers, given its small wattage. It certainly lends credence to the myth of tube watts being different from solid-state watts. It passed the Salmonella Dub test with flying colours.
       
      It weighs about 10kg with the big transformers at the back. I don't have any small children in the house so I'm happy enough leaving the tubes exposed but I see most commercial gear offers optional cages or shields over them. The big power tubes get up to around 160ºC 
       
      Planning to take this to a few peoples' places and try it on various different speakers.
       
      I see a few people around building tube gear. wonder if there's enough of us for a get-together/swap-meet some time?
       
    • By anthony vinyl
      Item: VTL compact MB100 monoblocks
      Location: blue mountains NSW
      Price: 2000 ONO
      Item Condition: very good
      Reason for selling: thinking of trying something different
      Payment Method: Pickup - Cash, Paypal( +3%),transfer
      Extra Info:
      the MB100s have a wide and deep sound - clear with heaps of tight punch. they will drive most loads comfortably with plenty of headroom. they are heavy and very well built- quite industrial. one mono is running the original VTL 5ohm output transformer, but the other runs a good quality but non-original 8ohm transformer.. i have listened to these extensively and can say that there is no variation in sound quality between the amps . if there is a negligible difference in audible output between them then it may be ironed out by using 12AU7s in one and 12AT7s in the other or via your pre but i have generally not found it necessary. these are 240V.  4 X EL34 XF2s and 4X 6CA7 EIs. i have included specific photo of scratch on one transformer .
       
      Pictures:




       

    • By countcrisp
      Item: Antique Sound Lab Hurricanes
      Location: Mooroolbark
      Price:  $2000
      Item Condition: Excellent
      Reason for selling: Too many Amps
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info:
       
      Here are my Antique Sound Lab Hurricanes in excellent working condition. 
       
      200w in Pentode and 100w in Triode, running 8 KT88 in each block which can be switched out to 6550, KT90 or KT 120. By altering the tubes you don't get an increase in power but alter the sound signature as all bias stays the same regardless of tube.
       
      Pick up is very much preferred as they weight over 30kg each. Would be willing to drop off to pack n send for them to pack if required.
       
      Have original manual also
       

       
      Pictures:
       
       








×
×
  • Create New...