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Franz Gysi 10th March 2008 09:31 PM

Studer 52

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

The Studer 52

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

Serge66 10th March 2008 11:11 PM

Thanks Frank for sharing this schematics.

I did not know Studer had produced an amp.

Thorens produced a amp also with EL84.

tubewade 10th March 2008 11:27 PM

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.


Franz Gysi 11th March 2008 07:40 PM


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


I plan to rebuild this promising circuit. I ordered output transformers specially for this project from, 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

Scheff 2nd January 2016 05:27 PM

Hi, I cannot make the image visible, can I have the schematics, please?

Franz Gysi 2nd January 2016 06:58 PM

The schematic is downloadable from here:


Scheff 2nd January 2016 09:15 PM

Thx a lot, vielen Dank , gut lesbar, toll.. Peter

jazbo8 3rd January 2016 08:30 AM

Nice, thanks for sharing.

costis_n 3rd January 2016 03:36 PM

An EL84 design from Studer, what could be nicer?


An EL34 design from them !

Scheff 3rd January 2016 03:59 PM

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?

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