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Old 13th May 2013, 09:05 PM   #391
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Quote:
Originally Posted by shaan View Post
GRRRRRR!

I bet If I lived near your house I would... ...


OKAY OKAY, I'm ultra jelly!

shaan
You wish, my cat keeps an eye on Fets.

Click the image to open in full size. Click the image to open in full size.

Regards zeoN_Rider
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Old 13th May 2013, 09:31 PM   #392
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Originally Posted by zeonrider View Post
My treasure:
OEM Hitachi 2SK135 and 2SJ50
regards zeoN_Rider
Exactly what I had to work with, only I have twice as many .
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Old 14th May 2013, 12:56 AM   #393
PMI is offline PMI  United States
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First, I would like to thank Lazy Cat and Shaan for an outstanding design, and for proving me and everyone else who will be using it with such excellent examples to follow.

PDF Files attached, as requested, including silk screen, bottom copper, silkscreen and bottom copper overlapped, with heatsink location shown in green. The files are 1:1 scale (100%). Dimensions are 102x64mm (approximately 4x2.5, 10 inches square). My BOM is also attached.

Please note that I have NOT etched any boards myself (mine came from a prototype board company), so if you intend to etch your own boards, please examine the files carefully. So, the boards you see in my pics are only assembled by me, not printed or etched by me. Therefore they have plated holes, gold pads top and bottom, solder mask top and bottom.

Two boards are assembled and tested, one has been working for about a week, and two are running as a pair for the last 3-4 days. I have sent out a couple sets of boards to other DiyAudio members, and I have a couple extra spare sets for anyone else who may be interested.

Offset adjust, bias, etc. are as described by Shaan. Bias on my boards is set by the two diodes, I have not installed the parallel resistor, although I may do so in the future.
Attached Files
File Type: pdf VSSA1b - Top Silkscreen.pdf (16.2 KB, 498 views)
File Type: pdf VSSA1b - Bottom Copper.pdf (11.6 KB, 409 views)
File Type: pdf VSSA1b - Bottom Resist.pdf (8.5 KB, 309 views)
File Type: pdf VSSA1b - Superimposed.pdf (27.0 KB, 440 views)
File Type: pdf VSSA1b (Bill Of Materials).pdf (43.3 KB, 485 views)

Last edited by PMI; 14th May 2013 at 01:05 AM.
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Old 14th May 2013, 01:26 AM   #394
PMI is offline PMI  United States
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The following series of pics shows a 3D rendering of the board layout, followed by a bare board, and assembled board. Note that the first image shows the common Faston-type flat tab connector for the power and speaker out connections.

The other pics of the boards show a 3-pos terminal block (which can be installed in the same place) which I am using only for test purposes.

The driver transistors are TO-126 mounted on 10x15x20 mm heatsink. The main heatsink is 10x4x1.3", 0.65C/W (from HeatsinkUSA, one of the companies which sells products here on DiyAudio).

There are no unique, expensive, or otherwise unobtainable parts. The the best of my knowledge, every component used has at least one second source.

Both boards I have assembled so far have been tested first with a variable bench supply, then with a variac, and 250 VA transformer/rectifier/filter, +/-35V DC nominal, 36-37V actual rail voltage, which is what I have been using up to now when I listen to the amp in stereo.

Once installed in the case, I will probably use an adjustable linear power supply.

Any questions, please ask or send a pm.
Attached Images
File Type: jpg VSSA1Bse.jpg (111.7 KB, 1046 views)
File Type: jpg VSSA1Bpcb3.jpg (343.1 KB, 1068 views)
File Type: jpg VSSA1B_Test2.jpg (558.8 KB, 1025 views)
File Type: jpg VSSA1B_Test1.jpg (229.6 KB, 429 views)
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Old 14th May 2013, 07:39 AM   #395
borys is offline borys  Poland
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My amp has ''beded in'' for good few days playing, I must say it only gets better.
Mid and high are acurate, detailed and very pleased to listen to. Bass i do not know exacly couse I have only small 15cm speakers with seas 22faf/g(but impression is good).
Thanks very very much to LazyCat Shaan and others hard working people.

Today I made quick meas, just for fun.
Attached Images
File Type: png vssa 38V.png (98.2 KB, 345 views)
File Type: png vssa vpp20.png (142.2 KB, 177 views)
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Old 14th May 2013, 09:53 AM   #396
AndrewT is offline AndrewT  Scotland
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Are the 7th and 9th real, or artifacts of your measurement procedure?
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Old 14th May 2013, 11:09 AM   #397
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Jason Kuetemann

Thank you so much!!!
Nikos
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Old 14th May 2013, 11:57 AM   #398
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@nikosokey, you are welcome. Please post your progress and impressions.

I will put together the other files and repost in Shaan's desired format to put my work into one post for future reference shortly.
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Old 14th May 2013, 11:58 AM   #399
naf is offline naf  Indonesia
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PMI, thank you for sharing your wonderfull layout.
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Old 14th May 2013, 12:06 PM   #400
borys is offline borys  Poland
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Quote:
Originally Posted by AndrewT View Post
Are the 7th and 9th real, or artifacts of your measurement procedure?
I will check that tomorrow. I am using audiotrak prodigy cube for meas, in output is opa2134 and dac is Tenor TE7022L as far i remember.
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