Electrocompaniet AW 250 DMB-R bias

[christerr]

Hi!

Searching for circuit diagrams and a service manual for this fine amplifier. Specifically looking for what the bias current in the output stage shall be.

 

[east electronics]

13mv over any of the emitter resistors

One trimmer is for bias and two are for the offset coarse and trim

Regards
Sakis

 

[east electronics]

do verify though that there is 13mv to all of them to make sure that all is ok.
Above 10-15% drift indicates either cooling issues in the specific transistor or mismatched transistors

Kind regards
Sakis

 

[christerr]

Thanks a lot for info!

I believe the emitter resistors are 0.2R and 65mA seems reasonable. Does the data come from the service manual? Somewhat difficult finding technical info on EC amplifiers on the web. The amplifier works fine, but just wanted to check since it runs quite hot.

 

[christerr]

Still very interested in a service manual and schematics for AW 250-R, though... Do someone have those I would greatfully recieve a copy in my inbox g34g3 (at) outlook.com

 

[east electronics]

This information is classified...you are on a need to know basis ...

 

[christerr]

Ok. Not sure I'm following you there...