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Old 28th August 2013, 09:23 PM   #31
neela30 is offline neela30  United States
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Old 28th August 2013, 10:06 PM   #32
neela30 is offline neela30  United States
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R265,266,274 and 275 check out.

Q220 +40v

Q221 +15.2v

Q222 -13.8v

Q223 -39.8v
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Old 28th August 2013, 10:25 PM   #33
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You need to check those transistors with the meter on diode-check and no power applied.

If you don't know how to test them, use the applet linked from the following page.
Basic Amplifier Repair - Transistor Test Applet Link
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Old 29th August 2013, 11:45 AM   #34
neela30 is offline neela30  United States
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Q220 550S.jpg

Q221 550S.jpg

Q222 550S.jpg

Q223 550S.jpg
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Old 29th August 2013, 07:21 PM   #35
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In order from top to bottom...

* shorted/leaky
* open base to emitter
* probably OK but slightly leaky collector to emitter. Could have been caused by touching the probes
* also appears to be leaky

I'd suggest replacing all of them.
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Old 30th August 2013, 04:10 AM   #36
neela30 is offline neela30  United States
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I'm looking at some of my options (on my phone at the moment) and notice one has a much higher power dissipation rating. Should this be a viable choice?

MMBT3904LT3G ON Semiconductor | Mouser
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Old 30th August 2013, 06:08 AM   #37
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Use/order the MMBTA06 and MMBTA56.
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Old 6th September 2013, 05:56 PM   #38
neela30 is offline neela30  United States
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I installed and checked everything and it seems the only thing that has changed is the right channel output is now -44v instead of -40v.

I guess this amp is making up for how easy the 150 was to repair!
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Old 7th September 2013, 04:09 AM   #39
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Are you sure you don't have an open source resistor or a bad output?

Sometimes they can fail during replacement.
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Old 7th September 2013, 04:25 AM   #40
neela30 is offline neela30  United States
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Anything is possible. I haven't had much time for thorough testing. I may need to pick up a magnifier to look over some of the delicate solder points. They look great to the nekkid eye but I also realize that type of soldering shouldn't be done after consuming nearly a pot of coffee ...
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