Threshold S/5000e idle current

[JacquesPlafond]

Hi All,

For a friend I am trying to repair a Threshold S/5000e but I wasn't able to find any schematics or adjustment data.
The problems are: It runs insanely hot (already after a few minutes of operation it becomes impossible to touch the heat sinks), sounds very thin and it has a 50Hz buzz on the outputs. (Which is more noticeable on the RCA inputs than on the balanced lines.)
I am aware that this amp is biased quite a bit into class-A, but still feel that the idle current setting might be utterly wrong on this one.
Does anyone have a diagram or a idle current setting?

Cheers,

jacques

 

[llwhtt]

Maybe a mod can move this to PASSDIY and he can get an answer from the man himself.

Craig

 

[analog_sa]

Perhaps, before adjusting the idle you should first fix it.

 

[analog_sa]

As for the bias, assuming this is similar to the Pass-designed S500, cold bias 100mV, hot bias 75mV.

 

[JacquesPlafond]

Better late than never:
Thanks, Guys. This information is highly useful for me. For some reason, I lost sight on this thread for some time. But your help is surely appreciated.

 

[Nelson Pass]

Maybe a mod can move this to PASSDIY and he can get an answer from the man himself.

Alas, I am not aware of such a model #, so I assume it was well after my
time.

That said, you would want to keep the temperatures of the sinks below
50 deg C, and that figure is a probably good indicator of proper bias.

 

[JacquesPlafond]

Hello Mister Pass,
many thanks for your feedback. I am rather certain that the amp has been a development that was done after your time.
I already adjusted the idle current as per your instructions and that seems to work great.

Cheers,
J.