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Old 6th February 2013, 02:54 PM   #561
Telstar is offline Telstar  Italy
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How close matching is recommended for the power transistors?
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Old 8th February 2013, 06:32 AM   #562
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Well, I never though of it that way. Just do the best you can to get matched compliments. Try for better than 5%.... I probably built mine with 1-2%. -Richard

BTW - I rarely hear any mention anywhere on DIYAUDIO forums -- the music. So here is a recommendation to listen to: Got to HD-Tracks and down load a tune called Freight Train Jam. Its from an album called The World is a Ghetto by WAR. Deep, deep bass, transients, highs and great playing.

I use flac format. Enjoy! -Richard

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Old 14th February 2013, 11:46 AM   #563
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How would this amp do with a .7VRMS DA converter instead of a 2VRMS one into a pair of 600-650 Senn's or a Hifimann HE-500?
thanks,
dennis h
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Old 14th February 2013, 02:42 PM   #564
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You may not be able to bleed your ears

jan
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Old 15th February 2013, 03:52 AM   #565
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Originally Posted by jan.didden View Post
You may not be able to bleed your ears

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Thanks Jan, will be ordering volume 3 shortly...
dennis h
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Old 20th February 2013, 03:57 AM   #566
RNMarsh is offline RNMarsh  United States
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Default BJT Compliment mathing jig circuit -

Here is a matching jig for BJT typs. Adjust values for your needs. Use +/- 12vdc for matching compliments. I published this in 1982 to go along with a MC pre-preamp article of mine. A sensitive DMM current range can be used in place of 'meter' shown. At null the two are matched.

Thx-RNMarsh
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File Type: jpg BJT Compl matching.jpg (773.9 KB, 382 views)

Last edited by RNMarsh; 20th February 2013 at 04:00 AM.
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Old 20th February 2013, 04:19 AM   #567
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I now have a full parts kit, and pwb thanks to Jack.

Just ordered vol 3 to get the article, but until I get it, I was wondering what voltage PS I need?

I am going to use a couple of Salas shunt boards as the regs, the group buy is closing in a few days.

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Old 20th February 2013, 08:24 AM   #568
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Quote:
Originally Posted by randytsuch View Post
Just ordered vol 3 to get the article, but until I get it, I was wondering what voltage PS I need?
+-12V.
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Old 20th February 2013, 12:40 PM   #569
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Quote:
Originally Posted by RNMarsh View Post
Here is a matching jig for BJT typs. Adjust values for your needs. Use +/- 12vdc for matching compliments. I published this in 1982 to go along with a MC pre-preamp article of mine. A sensitive DMM current range can be used in place of 'meter' shown. At null the two are matched.

Thx-RNMarsh
Finally, a use for box of Keithley meters I've been collecting since the 1960s!
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Old 20th February 2013, 12:43 PM   #570
Telstar is offline Telstar  Italy
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Originally Posted by jackinnj View Post
Finally, a use for box of Keithley meters I've been collecting since the 1960s!
speaking of which, I have recently some issue with mine, can i drop u a PM?

And got my transistors set today
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