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Old 17th December 2003, 12:35 PM   #21
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Quote:
Would it be any improvement in sound quality and do you have to re-adjust the bias?
You don't have to readjust anything but with those horror elcos at output i doubt if you'll hear any difference.
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Old 18th December 2003, 06:52 AM   #22
Zombie is offline Zombie  Sweden
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Hello!
What elcos would you suggest as replacement?
Cheers,
Tom
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Old 18th December 2003, 11:30 PM   #23
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That reminds me of the early '80's when I decided to build a 'lousy' stereo transistor zero bias 741 opamp input ceramic capacitor diode switched class H amplifier with a quasi-complementary configuration output with 2n3055s using mostly parts I had laying around. I don't even recall now if I used any heat sinks at all - I figured I could slide since the supply rails would only support about 25W/channel.

Well, it didn't sound quite as bad as I thought it would, although it wasn't anything special. But it was a fun two day near zero cost project.
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Old 19th December 2003, 01:59 AM   #24
djk is offline djk
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"Phase Linear ( i.e. Bob Carver ) used a whole bunch of 2N3055's in the 400 series IIRC ( about 6 or 8 per channel ) to deliver 200 Watts...."

I don't think so. A 2N3055 is a 60V part, a Phase 400 runs on 170V p-p.

Try MJ410
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Old 19th December 2003, 06:31 PM   #25
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Hi
there is also this interesting italian project

http://www.rudistor.com/sound-lab/ars20eng.htm

ciao
Filippo
www.audiofanatic.it
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Old 20th December 2003, 06:35 PM   #26
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You could use them in this circuit just swap the tip36's with the 2n3055's and swap r14, r,18 (both oops), r16, r19,19 to keep them on the emitters and you'd have fairly standard Sziklai pair amp.

Probably get you 100 watts or so.

You may want to add a pot of about 30k at r5 to gain some offset control, and a 220n cap between q9,q10 bases. The mjf15031 are a bit dated but it's what I had, any similar device could be used.
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Old 20th December 2003, 06:37 PM   #27
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this might help http://www.easyamp.com/img/revised-quasi.gif
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Old 20th December 2003, 06:51 PM   #28
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Easyamp
this might help http://www.easyamp.com/img/revised-quasi.gif
sorry but that is not the way to build a quasi complementary
output stage at all, biasing is all wrong and distortion will be awful.

Suggest you investigate using a "Baxendall diode"
and get your biasing of the output stage sorted.

sreten.
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Old 20th December 2003, 09:22 PM   #29
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Well there are a couple of ways to go quasi the Baxandall Diode is one as well as the triple quad like the quad 303 and while this is an oversimplification of the quad triple it works very well.

I donít have a distortion analyzer so I can only watch the scope and I see what your talking about but at the level the sine wave zeros at 210 and 330 degrees (increasing as I lower the input) is inaudible and I'm thinking this is acceptable for a couple older transistors. Anyway it seems like fun to do things a little bit different and it sounds good.

I would like to get a distortion analyzer does anybody have a suggestion.

Thanks
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Old 20th December 2003, 09:33 PM   #30
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I forgot to mention that r9,r10 are actually a 2k pot
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