I measured all resistors are are within specs.
The voltage at the emitter is equal between the 4388 of the same side.
While I was measuring, I also adjusted the idling current as detailed in the service manual.
The good news is that the amps seems OK now - it has been up and running for 10 mins without any temperature excursion and stable current draw.
On the other hand, there is a significant difference between the two channels for what concern the emitter DC:
4 mV and 7 mv on the left channel
15 mV on both 4388s of the right channel
The voltage at the emitter is equal between the 4388 of the same side.
While I was measuring, I also adjusted the idling current as detailed in the service manual.
The good news is that the amps seems OK now - it has been up and running for 10 mins without any temperature excursion and stable current draw.
On the other hand, there is a significant difference between the two channels for what concern the emitter DC:
4 mV and 7 mv on the left channel
15 mV on both 4388s of the right channel
Did you try swapping the emitter resistor to see if the problem followed the resistor?
How accurate is the meter at low resistance?
How accurate is the meter at low resistance?
No - I have not yet swapped the emitter resistor but I can try this as well.
The meter is a fluke 77 - not sure how accurate it is.
The meter is a fluke 77 - not sure how accurate it is.
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