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MTX 81000D (2)
MTX 81000D (2)
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Old 10th December 2014, 11:17 PM   #1
Exbass17 is offline Exbass17
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Exclamation MTX 81000D (2)

MTX 81000D (2)
This is another amp im working on (No Sound) Led 238 flickers on and off

I noticed D228 (A56) 3 out of 4 have been burned and resistors there parallel with at R430 and R431 I was wondering if there could be more that could have went out as well with these components any help?

I went ahead and removed (Q430,Q431,Q432,Q433) and I noticed led 238 is flashing faster now and extra component noise

Last edited by Exbass17; 11th December 2014 at 12:11 AM.
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Old 11th December 2014, 01:29 AM   #2
Exbass17 is offline Exbass17
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Replaced all listed components above now I have a fully lit led238 but now I am just getting static through the speakers with and without rcas connected
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Old 17th December 2014, 11:36 PM   #3
Exbass17 is offline Exbass17
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I cannot see anything else that could be burned board looks like its in good shape and inductors don't appear to be saturated like my other 81000d
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Old 17th December 2014, 11:58 PM   #4
Perry Babin is offline Perry Babin  United States
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Do you have a scope or any other way to follow the audio through the circuit?
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Old 18th December 2014, 12:04 AM   #5
Exbass17 is offline Exbass17
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Just the DMM I am hoping in a few weeks ill have a scope
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Old 18th December 2014, 08:32 AM   #6
Perry Babin is offline Perry Babin  United States
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It may be best to wait until you have the scope. What make model are you going to buy?
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Old 18th December 2014, 11:37 PM   #7
Exbass17 is offline Exbass17
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Fixxing to get one just like yours or close in case I get lost with it
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Old 19th December 2014, 04:33 PM   #8
Perry Babin is offline Perry Babin  United States
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Tektronix 465B?

It's a nice scope but you have to spend a lot of money ($400+) to get one that's been refurbished. They are about 30 years old and have some issues with failing capacitors. Otherwise, it's a great scope.

I'd suggest something from the Tek 2200 series. Send me auction numbers (via email) for any scope you intend to buy if you're buying from eBay.
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Old 8th November 2017, 03:25 PM   #9
jurand87sca is offline jurand87sca  Poland
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Hello. I need a Q239 symbol from mtx thunder 81000d. or replacement component. it's named c1nya..
sorry for my poor english
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Old 19th November 2017, 06:44 PM   #10
Bertje is offline Bertje  Netherlands
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Probably a JFET J111 but when you measure drain - source you have about 28 ohms. Then it's ok.
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