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Old 1st March 2013, 03:57 PM   #1
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Join Date: Feb 2013
Default 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.

Last edited by VolvoHeretic; 1st March 2013 at 08:04 PM.
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Old 1st March 2013, 04:23 PM   #2
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Join Date: Jan 2004
Location: Near Vancouver
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.

I am sending you a PM.
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
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Old 1st March 2013, 05:52 PM   #3
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Join Date: Feb 2013
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.
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Old 4th March 2013, 08:59 PM   #4
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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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