DIY Stax self bias conversion?

[kevin gilmore]

you need AC 120v not 12v

and that is for low bias only

Edited December 29, 2020 by kevin gilmore

[Vlaca]

Yes yes, i edited my post.

Thank you!

Yes i need low bias for my sr5-nb.

[Vlaca]

Here is the edited, right schematic(low bias):
 

 

Thank you!

[ericj]

Necrobump! Was there ever an official published schematic for one of the SB transformer boxes? And if so can i have it? 

About the zener. There is some confusion to be sure. In the SRD-7 schematics, the part is listed as Z1100 and the symbol is very clearly a bidirectional zener, what would be commonly sold as a transient voltage suppressor today. 

There appear to have been parts called "Z1100" from a few companies and some of them were unidirectional. 

The component on the boards in my two SRD-7s has no stripe at all, just an "A" logo and Z1100. One end is slightly pointy but that is probably just sloppy epoxy work. 

Semitec made a Z1100 TVS diode until 2005. See attached datasheet. Littlefuse makes a P6KE100CA with similar specs. 

Given the nature of the SB energizers it may be that a unidirectional part works better in that circuit. Which is sort of why i would like to know if there was a published schematic. I don't have any SB energizers myself. 

 

SMTCD00017-27.pdf