700 Series II full comp bias tx

WOPL Sniffer

WOPL Sniffer

Veteran and General Yakker
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Aug 10, 2015
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Minnie-Soda
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Screw it
Anybody have an alternative to the bias transistors on the 700 II? I think the original is a 2N3403....... I got a left channel running WFO and I think the original is toast. Didn't get a chance to troubleshoot yet but I'm sure (fairly) since pretty much the rest of the amp has all new parts. I was just laying here thinking about it. The DBT test dims then the bulb goes out., the DC Protection board doesn't click in so I gots me a small problem. I'll dig in hard tomorrow after work. It's a stock 700II full comp, with MJ21196's and MJ21195's in the back and a DCP, and the control board has been rebuilt.
 
Cool, if the originals are bad, I have those. I have not looked at anything, I just plugged it in to the DBT, it didn't work and I needed to crash.
 
Understand that. me no workee on anything today....12mg oxycodone, especially after the Demerol and Versed....
 
Yeah, had DC on the output. Replaced both Bias Transistors as the wires were not in the best of shape and the left one had a broken lead which if I remember right, Joe said it would turn that channel on which it did. I have only the bottom row of tranny's in and the DC protection still won't switch, I may still have an issue on the control board (Q103 mps A93). It looks like it got a lead damaged in the TS process. Don't know if that would cause DCP not to function though. I'll look at it tomorrow.
 
I think the trigger voltage on the DCP is just over one volt DC...
 
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