| sound_prodigy |
This problem started seeking a solution a week ago with the name of "testing FET transistors"
My hunch of a muffled buzzing and crackling sound comming from the left channel of my 88 princeton chorus turned from a blown transistor problem to wide spectrum of causes including dirty pot connections, leaky capacitors, fried resistors, and transformer problems. I have now found that 40-50 volts is being sent from the left output.
Are there any normal causes for this?
How can i fix them if so? |
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| Netlist |
If the amp is so damaged as you describe, I'm not surprised it has that much DC on the output. :)
Start with finding a schematic if you don't have it, measure every semiconductor and resistor. Recap thoroughly. Try to decouple the output stage and use a variac.
Good luck. Can you share a picture?
/Hugo |
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| anatech |
Hugo,
The transistor in question turned out to be an IC amp chip.
sound_prodigy,
If things were that easy we wouldn't need trained technicians and test equipment. Like a detective, you need to find out some facts and follow clues to the answer.
Get the schematic and make some measurements. I did link to the IC data sheet, so start by measuring all the voltages with respect to ground and posting.
-Chris |
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| Netlist |
Well this thread should go to chip amps then?
I should have asked for a schematic.
/Hugo :) |
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| anatech |
Hi Hugo,
I think we should have continued the same thread as before to provide continuity. Waiting input from sound_prodigy. I want to be certain it's the same amp.
-Chris |
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