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Old 30th March 2012, 05:53 PM   #1
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Default 6V6 schematic

Hi all

Ive got the old DIY build nerv itch again and this time Im looking for a schematic for an PP integrated stereo with 6V6 for output. Ive seen a couple of schematics floating around but cant make up which one to choose.

Anyone have any sugestions or recommendation?

Cheers
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Old 30th March 2012, 06:16 PM   #2
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What kind: UL, pentode, triode, +B, gain, input and output impedances, tone control(s)?
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Old 30th March 2012, 06:49 PM   #3
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Quote:
Originally Posted by Osvaldo de Banfield View Post
What kind: UL, pentode, triode, +B, gain, input and output impedances, tone control(s)?
Dont over do it! Keep it simple please, Im no technician.

What would you suggest?
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Old 30th March 2012, 07:20 PM   #4
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Originally Posted by Osvaldo de Banfield View Post
What kind: UL, pentode, triode, +B, gain, input and output impedances, tone control(s)?
How about this one? Would you say that it could be something worth building?

Click the image to open in full size.

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Old 31st March 2012, 01:19 AM   #5
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Originally Posted by h00hbt View Post
How about this one? Would you say that it could be something worth building?

Cheers

I don't think so, with a paraphase, AKA seesaw, phase splitter and a "funky" bias supply.

What's the budget? Poindexter's "Musical Machine" and the "El Cheapo" project I've been involved with both employ differential splitters and solid PSUs. If you plan to use O/P "iron" that's not particularly costly, "El Cheapo", with its NFB loop will (IMO) serve you better.

Oh yeah, the 'AQ5 shown in the "El Cheapo" schematic is, for all practical purposes, a 6V6 in a 7 pin mini bottle.
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Old 31st March 2012, 01:36 AM   #6
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Paraphase? What paraphase?
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Old 31st March 2012, 02:31 AM   #7
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Paraphase? What paraphase?
Sorry, I was fooled by the 270 KOhm part. It is differential, if slightly "weird". A voltage divider is setting grid bias for both 'T7 sections. Still the tail is way too short for identical 100 KOhm load resistors to be used.

My highly negative opinion remains intact, as that circuit uses full pentode mode "finals" and no NFB. The damping factor will be VERY poor.
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Old 31st March 2012, 02:55 AM   #8
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Agreed. But easily fixed. I do like the idea of raising the cathodes quite a bit, now you can use a CCS without a negative supply. Hook up some NFB to the idle grid and bingo. You're in biz.
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Old 31st March 2012, 03:45 AM   #9
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Originally Posted by Eli Duttman View Post
I don't think so, with a paraphase, AKA seesaw, phase splitter and a "funky" bias supply.
First, as above pointed out, it's not paraphase. Second, so what if it's paraphase? Don't knock it before you hear it. Sonically, I'd take paraphase over differential any day. Aside from transformer being the best sound, paraphase and split-load are my favorites.
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Old 31st March 2012, 03:15 PM   #10
Cassiel is offline Cassiel  Libya
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Sonically, I'd take paraphase over differential any day. Aside from transformer being the best sound, paraphase and split-load are my favorites.
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