Help! Marshall Help needed..

[-Analog-]

A day without some expensive suprise isnt a day anymore..


came home, fired up my 2 JCM800's

2205, 2203-

2203 has "HUM" that was never there before, not dirty power, cables or a dimmer in my room,

2205 is fluctuating in volume- one moment its at 4 then 2.5 then 4 like a slow phase in volume.

Powertubes?
I dunno

any hints/tips

So far I've tapped my tubes lightly, no change, tried alternate power outlets and still have the same noise at 2 locations.

Thanks in advance.

[Gatorman352]

Both amps acted up at the same time??? Did you try other electrical devices to see if anything else is effected? Are they amps connected in any way Slaved etc???

[tjauernig]

Any other and/or new appliances in your home that may be on the same circuit?

[-Analog-]

The circuit in my music room is a direct feed off the main 220 -

no other gizmos , did my usually unplug everything, get out the $300 guitar cable thing, still noise..

They are both hooked to my stereo rig, there mated at a DD-20, but its worked perfectly for 4 years no issues..
so then I tryed it with my framptone 3 banger which has ground isolation, still the same sounds..

Gonna try swapping some tubes, the 2203 has old KT88s.. and the 2205 has even older EL34s..

[phsyconoodler]

The chances of both amps having bad tubes at the same time is not likely.
I suggest you disconnect all the gizmos you have connected to those amps and plug them in in another room.Amp-power cord-guitar-speaker.Nothing else.

Quote:
They are both hooked to my stereo rig, there mated at a DD-20, but its worked perfectly for 4 years no issues..
so then I tryed it with my framptone 3 banger which has ground isolation, still the same sounds..

Don't assume this is not the issue just because it has worked fine before.