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Old 12th February 2011, 08:32 AM   #1
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Default PP EL34

Hi all

Ok, so my newly built PP KT88 Bill amp is working fine now and Im most impressed with the sound. Thanks to all who helped me with the troubleshooting.

Now I have some iron left over like PTX and OPTīs and I was thinking that maybe I would use the same schematic as for the KT88īs but adapt it for
EL34 tubes.

I understand I have to lower the anodedissipation but how do I do it?

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Click the image to open in full size.

Cheers
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Old 12th February 2011, 09:05 AM   #2
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Why not a bit more adventurous and try a different design ?
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Old 12th February 2011, 09:14 AM   #3
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Quote:
Originally Posted by Jaap View Post
Why not a bit more adventurous and try a different design ?
Hi Jaap

Well I did ask around for some advice for an integrated stereo PP amp schematic but there wasnīt anything that ticked all the boxes. I would like to use EL34 tubes as output tubes and I have transformers, no chokes. Anyway, what would you suggest?

Cheers
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Old 12th February 2011, 10:44 AM   #4
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Or maybe something even less adventurous.

Like an OddBlock. Except in lieu of the LM317T a cascaded DN2450.

Or more adventurous the PP2C by Allen Wright.
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Old 12th February 2011, 10:45 AM   #5
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Quote:
no chokes
Build a gyrator.
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Old 12th February 2011, 12:26 PM   #6
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Build a gyrator.
Gyrator??
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Old 12th February 2011, 02:38 PM   #7
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Quote:
Originally Posted by h00hbt View Post
Hi Jaap

Well I did ask around for some advice for an integrated stereo PP amp schematic but there wasnīt anything that ticked all the boxes. I would like to use EL34 tubes as output tubes and I have transformers, no chokes. Anyway, what would you suggest?

Cheers
I have myself built the PP-1C with el34 and e88cc tubes. I am sure this design is a step ahead of the Bill.
The engineers amp of Pete Millett has a lot of documentation on this forum. It uses 4 dollar output tubes and I expect it to be better than the Bill too.
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Old 12th February 2011, 03:01 PM   #8
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Quote:
Originally Posted by Jaap View Post
I have myself built the PP-1C with el34 and e88cc tubes. I am sure this design is a step ahead of the Bill.
The engineers amp of Pete Millett has a lot of documentation on this forum. It uses 4 dollar output tubes and I expect it to be better than the Bill too.
Hi Jaap

Well I would like to do without PCB and too many caps so I think Peteīs amp is out of the question, thanks anyway. Seams hard to find an integrated amp schematic that could work.

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Old 12th February 2011, 04:00 PM   #9
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Quote:
Originally Posted by h00hbt View Post
Hi Jaap

Well I would like to do without PCB and too many caps so I think Peteīs amp is out of the question, thanks anyway. Seams hard to find an integrated amp schematic that could work.

Cheers
I am building Pete's amp point to point.
too many caps ? I don't get that.
Finding schematics for PP amps that work is rather easy, google is your friend.
You can also look voor KT66/88, or 6550 designs.
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Old 12th February 2011, 04:30 PM   #10
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Quote:
Originally Posted by Jaap View Post
I am building Pete's amp point to point.
too many caps ? I don't get that.
Finding schematics for PP amps that work is rather easy, google is your friend.
You can also look voor KT66/88, or 6550 designs.
Hey Jaap

The musicangel schematic looks interesting, thanks. I will look closer at it and get back to you. About caps, At first glance of the picture I thought there where many caps but maybe not.

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