[GearGeek]

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~!

 

[krmathis]

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: