Re: humming and crackling Marshall 2266 valve combo


"Angus Manwaring" <angus@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:1159.269T1161T5594636angus@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi all,

I have a problem with my Marshall Vintage Modern 50 watt combo.

Who did it vote for?

After a bit of playing, maybe 5 minutes, it starts crackling and humming.
Often at some point the hum becomes continuous, and I can disconnect the
guitar lead, turn everything down and it just keeps humming. The only
control that makes a difference is the master volume, and if I reduce
that, the humming gets louder.

Funnily enough the problem is sometimes induced by playing G, fifth
fret,fourth string. :-/

The amp is a tad over 6 months old, so its under guarantee - but not the
valves. I need to work out if this is a valve problem or not.

How about the 'whack' control... get it into failure mode, then
*whack* it on top. I'm betting it's a solder joint... look at the
final (big) tubes while it's in failure... is one glowing red inside?
Damage is imminent, if so! You can have a solder problem
that ruins your tubes... if this happens, your dealer will charge
you for the tubes. Get the thing to the tech's ASAP and give
a full description of the problem.
__
Steve
..


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