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.
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.
13mv over any of the emitter resistors
One trimmer is for bias and two are for the offset coarse and trim
Regards
Sakis
One trimmer is for bias and two are for the offset coarse and trim
Regards
Sakis
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
Above 10-15% drift indicates either cooling issues in the specific transistor or mismatched transistors
Kind regards
Sakis
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.
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.
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
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