Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[John Rosenberg]

Hello,
Anyone out there have experience with repairing very early Hawthorne NJ Crest Pro Series amps?
There is a pair of MBS4991 (Silicon bidirectional switch) at the front end of the output board. 
The purpose as far as I can tell is as a voltage clamp at the first transistor stage.  Never noticed them on other Crest amps and
they don't show up on any of the schematics that I have. Which leads me to believe that it was a bad idea to have
them there in the first place. Which leads me to think that leaving them out might be a good idea.  Anybody care to weigh in?
Thanks!
John       

[John Roberts {JR}]

Try asking Peavey service.

I think JD Bennet might still be around (working in analog engineering group).

Ask service to ask JD...

JR 

[ProSoundWeb Community]