Can you verifiy that R97 is still 100 ohms?
Also measure voltage across R98 when you have the 5V across R97.
And also voltage across R41.
Also measure voltage across R98 when you have the 5V across R97.
And also voltage across R41.
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Show posts MenuQuote from: saturated on May 04, 2024, 03:18:47 PMPretty funny the book noted "although Vo can be directly measured across A and B it is good practice to make all measurements with respect to ground"Does Vo mean V offset? Where measuring direct from A to B should give zero when they are balanced?
Quote from: markorock37 on May 02, 2024, 07:49:32 PMT3 pins 1,2,3=C,B,EAs far as I know, there is no such thing as CBE pinout for these. But, apparently there are 2 versions of each, and could be either EBC or ECB.
T5 pins 1,2,3=E,B,C
Quote from: markorock37 on April 13, 2024, 02:57:58 PMI don't see 2SA872 on Mouser, is KSA992 a good sub?Yes, those should work.
Quote from: saturated on April 12, 2024, 07:53:18 PMSo I'm going out on a limb here and proposing that the 8k ohm 10w resistor is shorted to ground. It measures 170v on one end and zero on the other.That's not going out on a limb, that is good solid logic. (assuming you verified the resistor is ok)
A quick look at the schematic (a forensically enhanced version kindly provided by the Mighty Mick) to me places cross hairs directly on the zener diode.
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So I'm guessing that the zener diode is shorted...idk.
Quote from: RookieRecurve on April 11, 2024, 10:09:19 AMMy main concern is with the ground. I am unsure if sharing a ground with an external amp and an internal amp would cause any issues?It can cause issues with ground loops or worse. Some amps require their output (-) terminal to be isolated from ground for things like current feedback schemes.