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Old 25th April 2012, 07:34 AM   #11
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I think that should work. Also confirm that the Zener connected to the base of that transistor is within tolerance (6.2vZ).
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Old 26th April 2012, 12:34 AM   #12
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I will check that diode.

I am not sure if the MJE344 is a possible substitute for the 2SC3200. Otherwise, I am not finding a good one. The 3200s check ok out of circuit, but the one at Q19 is heating the board below it.
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Old 26th April 2012, 10:46 PM   #13
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I measure 5.93V accross D8. Not sure of the tolerance but that is within 10% of 6.2V.

Should be OK?
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Old 26th April 2012, 11:51 PM   #14
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I think it should be close enough. Did you replace the drivers yet?
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Old 27th April 2012, 12:25 AM   #15
RiLoWa is offline RiLoWa  United States
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No sir, I have not. I will have to order those parts.

Should I order the BD139 and the KSA1220A along with them?

What about the the 2SC3200? They test OK out of circuit.
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Old 27th April 2012, 01:10 AM   #16
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I'd suggest ordering the following just to have them on-hand.

BD139 and 140
KSA1220a and KSC2690A
MPSW42 and MPSW92

Also order the clip-on heatsinks for the TO-92 transistors.
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Old 12th May 2012, 11:22 PM   #17
RiLoWa is offline RiLoWa  United States
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Replacing the eight drivers with w42s and w56s did not change the symptom. The original set checked out ok out of the circuit. I forgot to get the parts you posted just above, so I will have to get those if they become vital to continued testing.
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Old 14th May 2012, 12:50 AM   #18
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Did you replace all of the other transistors that showed signs of overheating (the ones with bad solder joints)?
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Old 15th May 2012, 03:33 AM   #19
RiLoWa is offline RiLoWa  United States
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After replacing all of the transistors except for a pair of 2N5401s, the amp appears to be working correctly. I think it may have just been a broken leg on Q21 (A1275) that was the problem which was the last transistor I replaced. Hard to know for sure, I will have to do more testing on it tomorrow.
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Old 15th May 2012, 07:58 AM   #20
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If you want this amp to be reliable, long term, install heatsinks on the transistors that get too hot to touch within 1 minute. This will help reduce their operating temperature which will reduce the thermal stress on the circuit board and will help prevent premature failure of the transistors.
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