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Studer 52
Studer 52
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Old 10th March 2008, 10:31 PM   #1
Franz Gysi is offline Franz Gysi  Switzerland
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Default Studer 52

Hi

I want to show you a circuit, I found last week in the Studer archive:

The Studer 52

Click the image to open in full size.

Isn't this a very nice circuit?

Carefully selected tubes, DC coupled phase inverter, cathode feedback output transformer.

Not one part to much, fine engineering work.

A little Swiss Quad II?

I don't know, how many of them where produced. I have never seen one of them.

But it could be a very nice project to rebuild, isn't it?

Kind regards
Franz
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Old 11th March 2008, 12:11 AM   #2
Serge66 is offline Serge66  Switzerland
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Thanks Frank for sharing this schematics.

I did not know Studer had produced an amp.

Thorens produced a amp also with EL84.
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Old 11th March 2008, 12:27 AM   #3
tubewade is offline tubewade  United States
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Yes, it is a very nice circuit. I like the Mullard front end and the cathode feedback configuration. I also like 6BQ5/EL84s very much. I have an amplifier that is very similar to this one but does not use cathode feedback.

Thank you for sharing this schematic with us.

Wade
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Old 11th March 2008, 08:40 PM   #4
Franz Gysi is offline Franz Gysi  Switzerland
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Hi

I can share more info with you: the production datasheet from the output transformer (sorry, written in German):

Click the image to open in full size.

Click the image to open in full size.

BTW:

I plan to rebuild this promising circuit. I ordered output transformers specially for this project from www.roehrentechnik.de, from Gerd Reinhoefer. He will produce them following the datasheet, but using a double chamber in M102 format and todays iron quality. It will be a very well sized tranny for this amp. The price will be the same like the production trannies, he is offering!

Should you want the original circuit and the tranny datasheet in PDF, just drop me a mail under firstname dot name at studer dot ch

Kind regards
Franz
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Old 2nd January 2016, 06:27 PM   #5
Scheff is offline Scheff  Germany
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Hi, I cannot make the image visible, can I have the schematics, please?
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Old 2nd January 2016, 07:58 PM   #6
Franz Gysi is offline Franz Gysi  Switzerland
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The schematic is downloadable from here:

ftp://ftp.studer.ch/Public/Products/...l_52_Diagr.pdf

Franz
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Old 2nd January 2016, 10:15 PM   #7
Scheff is offline Scheff  Germany
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Thx a lot, vielen Dank , gut lesbar, toll.. Peter

Last edited by Scheff; 2nd January 2016 at 10:18 PM.
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Old 3rd January 2016, 09:30 AM   #8
jazbo8 is offline jazbo8
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Studer 52
Nice, thanks for sharing.
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Old 3rd January 2016, 04:36 PM   #9
costis_n is offline costis_n  Greece
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An EL84 design from Studer, what could be nicer?

Answer

An EL34 design from them !

ftp://ftp.studer.ch/Public/Products/...l_22_Diagr.pdf
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Old 3rd January 2016, 04:59 PM   #10
Scheff is offline Scheff  Germany
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Amazing, interesting to see the differences to the EL84 version... thanx for that
ah, by the way: does anyone have an instruction how to make an OT for this one?
Peter
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