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Old 31st January 2013, 06:31 AM   #61
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Please read #59 and #60

Its the MJE3055T thats getting so hot.

Is it safe to pwer the amp with the 3055 removed to see if the current draw goes away?

What would cause this to get so hot?
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Old 31st January 2013, 02:15 PM   #62
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If the voltage is the same on both outer legs, it would appear to be shorted.

Does the emitter of the 3055 connect directly to 4003 diode that connect directly to the emitter of the D41 for the fan?
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Old 31st January 2013, 07:16 PM   #63
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Does the emitter of the 3055 connect directly to 4003 diode that connect directly to the emitter of the D41 for the fan?

YES

I ordered 20 MJE3055T and 20 MJE2955T from Mouser to have them in stock.

I tried to power the amp up with the 2 transistors not installed and no go. It just made a loud buzzing noise.

Why wont the amp power up without these 2 transistors installed?
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Old 31st January 2013, 07:39 PM   #64
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When you shorted the emitter of the fan driver to the cap, it may have pulled current through that diode and from the regulator. Lift that diode and reinstalled the regulator transistors to see if it still gets hot.

Was the fan running when the 3055 was overheating?
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Old 31st January 2013, 08:38 PM   #65
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Yes the fan was running while it was overheating.

I already junked the 2 transistors. I threw them in the garbage last night and the garbage man already came and emptied the dumpster.

Why wont the amp power up without the 3055/2955 installed?
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Old 31st January 2013, 09:02 PM   #66
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Without knowing precisely what part of the amp is malfunctioning I can't tell you why it won't power up with those out of the circuit.

The fan was pulling current through the regulator. That's why it was heating up more than the other. MTX ran the fans from the +15v regulator on some of their amps. It caused extensive damage when the amp was powered up with the regulators unclamped. That could happen in these amps as well.
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Old 1st February 2013, 12:59 AM   #67
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Well I did power it without them clamped and the 3055 got really hot. Funny thing is I powered this amp numerous times as well as the other 650's I've repaired unclamped with no issues. Is it maybe becauase it was shorted? I hope I didn't do extensive damage.
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Old 1st February 2013, 01:28 AM   #68
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You can use other transistors as a sub if you're waiting on the originals to continue troubleshooting. The 6488 and 91 will work.

The fan wasn't running/connected on the other amps when the transistors were un-clamped.
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Old 1st February 2013, 04:25 AM   #69
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The originals shipped out today from Mouser. I dont have any subs that I know of in that package size.

I also found that one of the power supply transistors base leg had lifted the entire pad off of the board and was not connected.

There is like 4 D44VH10 and 1 D45VH7 transistors in each side of the power supply.

Is this correct? Why the mixture?

I think maybe this happened while tightening the board into the sink a few times. I repaired it by running a wire from the bottom side and folding it over under the base leg of the 44 so as to have something solid to solder it to.
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Old 1st February 2013, 01:21 PM   #70
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That's correct. I'm not sure how the D45s are being used but they connect to the small transformer.
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