"Keith G" wrote in message
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"Iain Churches" wrote in message
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"Keith G" wrote in message
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"Keith G" wrote


Found the hum on the AEG Solidtube tonight - after swapping 3 valves to
no effect, I thought it was a poor earth connection on the casing at
one point as it could be temporarily affected by gripping it here and
there. Then reading the service .pdf that someone kindly put me on to
(Ian? Iain? - I'm on a different machine, so I can't see who it was) I
checked and found it was the bass attenuation switch:


Typing ******** as usual - its a -20 dB 'pad' switch!


The sun always shine on the righteous, they say - let's just hope it
don't *hum*...!!!


OK, not so righteous it seems - the hum has become erratic and
irrational and it hums with the switch the other way now, so I guess
it's gonna have to go off for a pro repair.

(Too fiddly and will probably need parts....)


Before you send it off. A colleague tells me that this mic
has a spring through which the case is grounded.
Check that it is making good contact.


Done that, Iain and also trapped a bit of aluminium foil between the body
halves to ensure a bond, but it really is the switch - which means it is
likely be a coil on the board.

OK. Just a thought.


Way too fiddly to be soldered with a heated shovel and will want dinky
little parts near impossible to get outside the pro repair circuit, I
suspect.

There's no rush to fix it (check your emails) and I can drop it into (or
post it to) a place in Letchworth, just down the road. It's
probably/almost certainly going to cost a wunnah or so to fix, which is
what I budgeted for when I bid on it knowing *full well* that it was
almost certainly going to have a real reason for someone getting rid!

If you mean Sound Technology, they are very good

It will still be a reasonably-priced purchase even after repair.

I thought that Harman were word-wide agents for AKG, so
try also: This may be old info.

HARMAN PRO UK
Cranbourne House,
Cranbourne Road,
Potters Bar
Herts, EN6 3JN
www.harmanprouk.com

Max Lindsay-Johnson
Phone: +44 1707 668041


Iain