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Type: Posts; User: Jazz P Bass; Keyword(s):
Don't forget the voltage rating.
That is the voltage level that the fuse can withstand without internally arcing over in the event of a failure.
Have you tried 'biasing' the tubes until the crossover notch just disappears?
I use a lowish output voltage for the test.
Forget about the slight notch that appears when approaching full power!
If you start mucking around replacing caps & other parts with the amp nonfunctional at this point, how will you know if you got it correct.
That is why I strongly advise that you troubleshoot the...
The schematic copy with better resolution:
Is this the Sano amp that the reverb recovery goes to a separate 5" or 6" speaker?
My advise is to NOT do anything until else to the amplifier you get the amp working.
1N4007 diode is what you want.
(1N7007 does not exist)
It's only a guess but I would venture that the Green wire is ground.
More direct link to the schematic: https://music-electronics-forum.com/attachment.php?attachmentid=53906&d=1560185842
Reload of schematic: 53906
If the amp is anything like some of the QSC amps (as concerning the I/P limiting circuit) this should be a once and done adjustment.
QSC has you drive the amp to full power into a dummy load (we are...
A quick, down & dirty test of the OT polarity with negative feedback:
-Drive the amp to a certain level.
-Measure the output voltage.
-Now disable the feedback path (wire, resistor) while...
Not too clear on the issue.
If you disconnect the SMPS X4 connector the 40Vdc /80Vdc voltages are good?
The Classic 30 switch will work.
Non DSP: 53828
Here is the Champion 30 DSP service manual.
Read Page 5 as it pertains to the signal flow.
Here is the schematic that I have: 53816
Pignose.com calls out a 15Vdc supply: https://pignoseamps.com/product/regulated-ac-adaptercharger-for-hog-series-amps/
worth a shot ; https://www.ebay.com/itm/Marshall-8100-Valvestate-100V-One-Tube-Preamp-Head-Chassis-Only-parts-Repair/264281080453?hash=item3d88614285:g:ITkAAOSwhrpcRMvg
Unfortunately, solid state amp repair can be a real 'bear'.
Tube amps are relatively easy as the high voltage stages are coupled to the next stage by Vdc blocking capacitors.
Which makes things...
Awe inspiring troubleshooting!
"You mind sharing how and where I can measure AC ripple".
You have already demonstrated that you can safely measure the DC voltage on the power supply nodes.
So do the same except set your meter to...
That circuit is an inverting amplifier.
If you have ANY voltage across R1 (1K), then that voltage will be 'amplified' by the gain of the circuit . (47K/1K).
Have you attempted to contact Proel?
Where in the world did you find those rivets?
That looks like a winner.
I would predrill a small pilot hole before hammering in the new rivets.