January 7th, 2009
Please see this thread on diyAudio Forum for detailed step by step instructions on assembly of LM3875 kit; lot of info there will apply to LM4780 kit as well.
All kits are in stock and ship immediately. For more info on USB AND SPDIF DAC kits please contact me directly.
December 11th, 2007
It's been over two years since I wrote any news. Just to let everytbody know that all the kits are in stock and ship immediately.
The original NOS DAC has been upgraded with a new board and slightly improved layout. Also, beginning this summer a USB version of the DAC is avalable.
Please contact me directly for more info.
SPDIF NOS DAC
USB NOS DAC
I also collected useful links with regards to some of my products and their assembly, and you can find them
Patek Integrated amp has been created recently and is available by special order.
During those two years many of my products received very positive reviews and two of them even made it to the cover of hi-fi+
September 2nd, 2005
After short vacations, I'm back here again. There will be some new projects available, one of them is an active preamp with remote controlled, stepped volume attenuator.
August 10th, 2005
The first Patek amp has been delivered, you can read about it
June 3rd, 2005
It's been well over two years since I started
on diyAudio, which became second most popular topic there. I'm glad to see the thread is still active, especially when comments like this are being posted there:
Hi Peter and all Gainclone builders,
I would like to share with you my experience concerning the Gainclone I have built.
I have been using a nice SET amplifier (home grown) for about 7 years, the sound of which was pretty nice to me. Not very long ago I even had the chance to A/B test it with a quite expensive although not triode amp (Audio Note P2SE, approx. 3000 USD retail I believe). After a week of listening I definitely felt that there is quite a difference, the advantage in most areas (dynamics and especially information content) being on my amp's side. Nevertheless, I heard so much about the Gaincard so I went to a local dealer and listened to it. It was quite impressive, although I was listening to horns this time. (At home I use large Audio Note speakers which sound beautiful for me). So I decided I would buy a kit (premium) from Peter and build it, maybe just for fun.
I finished building the kit about a month ago. When I tried it first I was actually shocked. It turned out that the SET amp is "using" a pretty thick "curtain" between me and the speakers. I could hear significantly more from the music than before. It was amazing. However, there was something I did not like perfectly. There was some sharp edge of the sound, which made it tiring to listen to for longer periods, especially at louder (I would call normal for acoustic instruments) levels. After a few weeks of experimentation, last night I found the solution. Until yesterday, I was using the (pretty expensive ) Audio Note cable I used with the triode monster. Yesterday I thought: what if I change those cables with something similar to what 47Lab suggest. I had at home some Cat5e UTP cable so I took it apart and installed single wires of the 24 AWG cable. Guess what: I was shocked again. Last night was the first occasion that I could actually hear acoustic instruments and players making music in space. I had the feeling I was not listening to an electronic music reproduction device but I could actually forget about it.
The last thing I would like to add is that for more that 13 years this was what I have been searching for. In 1992 I was at a HighEnd show and listened to a full Audio Note chain, including the famous Ongaku and other extremely expensive stuff. Then I absolutely felt that there was no device at all, only music. However, because the total price of that suff was well over 100 000 USD, I thought I would never be able to come close to that. It seems that this tiny little amp helped a lot in that.
Sorry for the long post. I know it is not usual to write so long but I had to tell you what I experienced.
PS. Thanks Peter for the kit!
May 18th, 2005
The new LM4780 boards are presently available. Those boards are improvement over the previous version: in addition to parallel configuration, they also allow bridging and stereo setup (from a single LM4780 chip). More info can be found
The Dac kit is available as well, ordering info can be found
The pictures of a complete board are posted
February 27th, 2005
The new LM3875 boards are available for immediate shipment. You can see some pics with all the options described
February 17th, 2005
The LM3875 boards have been ordered this week and delivery is expected on Tuesday. Those are marked as SE (Special Edition), as they accept premium resistor sizes and the feedback resistor placement is improved (board mounted, directly at the chip). The Premium version of the board is aditionaly gold plated. Both Premium and Clasic versions of the board feature exactly same artwork.
Besides some minor layout differences, smaller size and some additional pads for more footprints of main and aditional bypass caps (for instance, you will be able to mount Panasonic 1500u cap on rectifiers board), it is a functional equivalent to Rev.3 board offered by Brian.
February 14th, 2005
I'm resuming accepting kit orders.
The Premium kit has been revived. The PCB is also changed, with some improvements in layout and component placing. No Zobel parts are included with Premium kits , but they can be added if specifically asked for (the board is Zobel ready). The new LM3875 board will also accept snubber, if someone wants to use it. I'm still experimenting in that area though.
I have LM4780 boards in stock, so anybody ordering those kits can expect immediate shipping. I will work on a new version of LM4780 board, which will also accept snubbers (but will be not increased in size) and in addition to parallel mode, can be configured for stereo operation as well.
Since LM4780 is basically 2 x LM3886, I will be not presently pursuing any implementations with 3886 chips. Instead, I will be offering TDA1543 DAC soon.
Stay tuned for more,