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VolvoHeretic 1st March 2013 04:57 PM

Help with Stax SRA12S Electostatic amp/preamp
Greetings all, I am looking for some ideas of how to get my dead Stax SRA-12S electrostatic head phone class A power amp / preamp fixed. I use it only as a preamp to drive a Crown DC300A pushing a pair of Altec A7-500 speakers.

My technician says that the dual voltage transformer is shot and an E-mail to Accutech, the authorized Stax importer/service center says they no longer carry parts for it.
He tried to just install a low voltage transformer but it still did not function and said that I am SOL. It keeps blowing the main fuse. I do not need the electrostatic side of the unit, is someway of a workaround to the transformer issue?

I am electrically illiterate so anything said will have to be in baby talk. Thanks for any help. James
Here is a link for the service manual and schematic.

Cal Weldon 1st March 2013 05:23 PM

Hi James,

Welcome to diyAudio. I am glad you joined us. For some reason I thought you were already a member here but maybe that's just overlap with the Altec site. Let me know if there's something you need help with here. Other than the post above that is. :D

I am sending you a PM.

VolvoHeretic 1st March 2013 06:52 PM

Thanks Cal, I will try to behave. I hope I shouldn't have posted this under the power supply threads. :) This is all new to me. Kind of like joining Mopar, Chevy, and Jeep forums to find out how to modify my Volvo.

VolvoHeretic 4th March 2013 09:59 PM

Friendly bump. No one? Could I use two transformers mounted externally to get the needed 26 and 260 volts output (? I can't open the PDF schematic on this computer) ?

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