Guest Benjet Posted February 25, 2018 Share Posted February 25, 2018 Ok, amps is a design by a guy called John Thackray. You can contact him at john_thackray@yahoo.com or find him on Facebook. Great guy, very helpful. He sells them fully built or as a PCB only. I got two of the PCBs and built them in a balanced design. Really sounds great and with the ability to roll 12au7 tubes and the power of mosfet to drive whatever headphones you throw at them. I’m driving the pants off my power hungry, low impedance planer headphone with great effect. Awesomeness [emoji106][emoji106][emoji106][emoji2] Link to comment Share on other sites More sharing options...
mwhouston Posted February 25, 2018 Share Posted February 25, 2018 I like hybrids, you can get the best of both worlds. All on a single PCB makes construction easier and neater. Neat job mate. Matching gear all looks good. Link to comment Share on other sites More sharing options...
Guest Benjet Posted February 25, 2018 Share Posted February 25, 2018 I like hybrids, you can get the best of both worlds. All on a single PCB makes construction easier and neater. Neat job mate. Matching gear all looks good. The stack is getting bigger Link to comment Share on other sites More sharing options...
mwhouston Posted February 25, 2018 Share Posted February 25, 2018 (edited) A few weeks back I posted an image of the inside of a Jean Hiraga Le Monster 8W SS DC amp. I have been enjoying the amp ever since but thought I should put up some images of the finaly finished amp. The sound of this amp is completely natural, relaxed with good bass control and a balanced mid and treble range. Took it to another SNA members house last night where he exclaimed it sound very natural, exactly as I found it. So after twenty years in the making, the final product. d Edited February 25, 2018 by mwhouston 2 Link to comment Share on other sites More sharing options...
Guest Posted February 25, 2018 Share Posted February 25, 2018 46 minutes ago, mwhouston said: A few weeks back I posted an image of the inside of a Jean Hiraga Le Monster 8W SS DC amp. I have been enjoying the amp ever since but thought I should put up some images of the finaly finished amp. The sound of this amp is completely natural, relaxed with good bass control and a balanced mid and treble range. Took it to another SNA members house last night where he exclaimed it sound very natural, exactly as I found it. So after twenty years in the making, the final product. d Nice job Mark, quite like a neutral sounding power amplifier regardless of power rating Great to see hard wiring with the power cable rather than an IEC. Lovely Link to comment Share on other sites More sharing options...
mwhouston Posted February 26, 2018 Share Posted February 26, 2018 59 minutes ago, 125dBmonster said: Nice job Mark, quite like a neutral sounding power amplifier regardless of power rating Great to see hard wiring with the power cable rather than an IEC. Lovely Thanks mate. Yes one less connection to fail or go noisy. Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2018 Share Posted February 26, 2018 51 minutes ago, mwhouston said: Thanks mate. Yes one less connection to fail or go noisy. (it's actually 3, A, N and E) Link to comment Share on other sites More sharing options...
Guest Benjet Posted March 5, 2018 Share Posted March 5, 2018 Looks great...Spill the beans... More info please... I’ve just bought the last two SE amp PCBs from John. If any one would like one let me know. They cost me $20USD delivered for both and I’ll on sell them for cost plus postage. Easy to build and a really nice sound. I’m in discussions with John about the next version. He might revise the design to make a balanced amp all on one board. Link to comment Share on other sites More sharing options...
Spinnergeoff Posted March 7, 2018 Share Posted March 7, 2018 I've reduced my open baffle floor standers Mk.2 to $299 as of today. Link to comment Share on other sites More sharing options...
zog Posted March 8, 2018 Share Posted March 8, 2018 (edited) I've been pretty slack on the DIY audio front recently, partly because of a changing work situation giving me less free time, and partly because my house is already oversupplied with DIY audio gear so I dont need any more... But I was intrigued with the newish TI TPA3255 class D amp module, ordered one late last year and finally got around to firing it up in test mode in an old amp chassis with a 350W meanwell SMPS.. No serious listening yet but runs very quietly, if it plays well I'll use it to drive the 15" low frequency speakers in my active system. http://www.ti.com/tool/tpa3255evm p.s. @Snapper() that dead amp chassis you gave me finally got some use :-) Edited March 8, 2018 by zog 3 Link to comment Share on other sites More sharing options...
mwhouston Posted March 8, 2018 Share Posted March 8, 2018 If you want a bit of amp/speaker protection you can run an inline fuse to one side of each speaker connection. 2A quick blow is a good starting point. Link to comment Share on other sites More sharing options...
zog Posted March 10, 2018 Share Posted March 10, 2018 On 3/9/2018 at 7:21 AM, mwhouston said: If you want a bit of amp/speaker protection you can run an inline fuse to one side of each speaker connection. 2A quick blow is a good starting point. The TPA3255 has a lot of "mod cons" like speaker protection already built into the chipset. Link to comment Share on other sites More sharing options...
zog Posted March 10, 2018 Share Posted March 10, 2018 On 3/8/2018 at 10:56 PM, zog said: No serious listening yet but runs very quietly, if it plays well I'll use it to drive the 15" low frequency speakers in my active system. @Snapper() It's now deployed in the active system.. dead quiet when not playing when driving 98db efficient 15" woofers, 7.8W idle power use, so far so good.... Link to comment Share on other sites More sharing options...
TMM Posted March 15, 2018 Share Posted March 15, 2018 (Finally) finished these bad boys. There's a pic gluing the bent lamination sides back in this thread years ago haha. 10 1 Link to comment Share on other sites More sharing options...
Upfront Posted March 15, 2018 Share Posted March 15, 2018 (Finally) finished these bad boys. There's a pic gluing the bent lamination sides back in this thread years ago haha. Now they are Cool! Beautiful work mate. Any chance you can post some build photos so we don't have to go digging?? Link to comment Share on other sites More sharing options...
mwhouston Posted March 15, 2018 Share Posted March 15, 2018 31 minutes ago, TMM said: (Finally) finished these bad boys. There's a pic gluing the bent lamination sides back in this thread years ago haha. 50hz to 20k - can't ask for more. Link to comment Share on other sites More sharing options...
TMM Posted March 15, 2018 Share Posted March 15, 2018 1 hour ago, Upfront said: 1 hour ago, TMM said: (Finally) finished these bad boys. There's a pic gluing the bent lamination sides back in this thread years ago haha. Read more Now they are Cool! Beautiful work mate. Any chance you can post some build photos so we don't have to go digging?? Unfortunately the only other pic I took was this one of my haphazard method of gluing the side laminations (3mm MDF) to the internal braces. After this the MDF top, bottom and back were glued and trimmed flush with a router. Front bolted on, flush trimmed. 19mm and 3mm roundovers applied to all edges, then everything was coated with epoxy, sanded/prepped and painted with rattle cans. I plan to do it all again in the future to make some subwoofers with a matching curved box shape and a 10" mounted into the side, effectively turning these into floorstanders. That should make for some interesting routing work. 3 Link to comment Share on other sites More sharing options...
Upfront Posted March 15, 2018 Share Posted March 15, 2018 Unfortunately the only other pic I took was this one of my haphazard method of gluing the side laminations (3mm MDF) to the internal braces. After this the MDF top, bottom and back were glued and trimmed flush with a router. Front bolted on, flush trimmed. 19mm and 3mm roundovers applied to all edges, then everything was coated with epoxy, sanded/prepped and painted with rattle cans. I plan to do it all again in the future to make some subwoofers with a matching curved box shape and a 10" mounted into the side, effectively turning these into floorstanders. That should make for some interesting routing work. Good work mate. Some reasonable bracing inside too! I like it! Well done! Take more photos next time! [emoji13] Link to comment Share on other sites More sharing options...
mwhouston Posted March 16, 2018 Share Posted March 16, 2018 My woodworking and tube amp buiding mate Don has made me a few bases in advance. The lighter Cypress base may be used for a single stage 6SN7 (Psavne 50 year Treasure) preamp. The darker base - Spotted Gum - my next tube headphone amp with Sophia Priness rec. tube. Just treated the bases with some rubbing oil. It has a low luster and lifts the grain a little. It honeys-up the Cypress base. Also adds good protection to the surface against stain etc. 3 Link to comment Share on other sites More sharing options...
mwhouston Posted March 16, 2018 Share Posted March 16, 2018 Working on a MM phone preamp for a guy. One of my many varied "Mimics". This is the smallest I have made on a tiny piece of vero-brd. While waiting for the enclosure to dry. Toady I assemble the enclsoure and add wires to the cct. brd. Ready for wiring. Link to comment Share on other sites More sharing options...
mwhouston Posted March 16, 2018 Share Posted March 16, 2018 In the past I have sprayed (Epoxy Enamel) in black, yellow, hammer tone, blue and red. Here is an example of the finish in red. Colour is called red delicious. http://retro-thermionic.blogspot.com.au/2017/08/mimic-carbon-phono-mm-preamp.html 2 Link to comment Share on other sites More sharing options...
mwhouston Posted March 17, 2018 Share Posted March 17, 2018 Assembled but not wired. 2 Link to comment Share on other sites More sharing options...
mwhouston Posted March 19, 2018 Share Posted March 19, 2018 Inside of the latest Mimic - "Mimic Carbon II". Just finished and sounding incredible. Big polies on the output. 2 Link to comment Share on other sites More sharing options...
mwhouston Posted March 28, 2018 Share Posted March 28, 2018 Another prototype 6J6A headphone amp with OPTs from Oatley. This time with toroid to stop hum induced into the OPTs by the power tranni. I will breadboard this one also. 1 Link to comment Share on other sites More sharing options...
Batty Posted March 28, 2018 Share Posted March 28, 2018 That is the sort of thing I am after. Link to comment Share on other sites More sharing options...
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