SOURCE: Marshall AS50R produces a loud hum with an
Sounds like a power supply filter cap has gone bad.
The hum you're hearing could be the 60 Hz AC, especially if it is a low frequency.
If that IS what it is, the Zoom G2 was just a coincidence.
SOURCE: Reverb problem
I highly doubt the reverb pan is dead, there are TL072 opamps on the input and output of the Reverb pan. Check those out. You can get the schematic from fenders website here. U6A and U6B are what you are looking for.
http://www.fender.com/support/amp_schematics/pdfs/Roc_Pro_1000_Schematic_B12.pdf
SOURCE: my marshall mg100hdfx digital fx rack wont work
sounds like the effects module has stopped working . you could try re-working the joints around the i.cs on that board if you have a rework station. i have only managed to repair one baord this way suggest replacement is the best course of action. uk cost of panel approx £50.00 + fitting
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SOURCE: my marshall classic reverb 30 makes sound some
The volume control knob PROBABLY is broken, dirty or has bad soldering to the circuitry.
Use some CRC226 in the control if dirty. While you have the unit apart, check the soldering and for any circuit board cracks.
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