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electrect & electrostatic's amp

post #1 of 2
7/13/09 at 9:38pm
Thread Starter 
Hello, I was just wondering

If i can use the amp for my sony electrect for my stax /koss esp950

?

and also , how can i modify the srd7 into a srd7 with a pro output?

any study material would be welcome , thanks in advance~!
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post #2 of 2
7/14/09 at 4:23am
You can not use your Sony electret amp for the Stax / Koss ESP950, since the amp do not provide bias supply. The other way around should work though.

To add Pro output you need to build a new bias supply (580v instead of 230v), and plug the center hole of the output jack. Or replace it with a 5-pin one.
Schematics for the two Pro bias SRD-7s below. Which should help you figure out the bias supply.

SRD-7/MK2:


SRD-7 Pro:
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