one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing



ta in advance


Dave

Dave xxxx wrote:
one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing



ta in advance


Dave

Much more information is needed:

Type of amp?
*ALL* Tubes involved?
Age of amp?
How long have you had it?
How long has this been happening?
How much do you know about tube-based electronics?
What, if anything has been done to it by you or to your knowledge?

and so forth...

NOTE: Do not screw around inside the amp unless you know what you are
doing. Lethal voltages are present.

Peter Wieck
Wyncote, PA

" Dave xxxx" wrote in message
k...
one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing


Is this a stereo amp, if so are both channels playing up? Fixed or cathode
bias?

On Wed, 23 Aug 2006 13:05:18 GMT, " Dave xxxx"
wrote:

one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing



ta in advance


Dave


Leaky coupling cap? You could disconnect the power stage from the
driver stage by lifting out one end of a coupling cap and see if it
clears up...

Keith G wrote:
" Dave xxxx" wrote in
message k...
one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud
pops. this is happening with or without music playing


Is this a stereo amp, if so are both channels playing up? Fixed or
cathode bias?

stereo amplifier and both speakers move

" Dave xxxx" wrote in message
...
Keith G wrote:
" Dave xxxx" wrote in
message k...
one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud
pops. this is happening with or without music playing


Is this a stereo amp, if so are both channels playing up? Fixed or
cathode bias?

stereo amplifier and both speakers move


OK, how many valves per channel, how many of them glow and valve or ss
rectifier?

(Before you even answer, the one valve per channel in a SET is a blessing in
itself!! ;-)

In article ,
says...

one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing



ta in advance


Dave


Infra-sonic motor-boating?

Keith G wrote:

Keith, All:

We are being had. Based on the information we have to-date, the amp
could be partially under water....

Any/further speculation should be suspended until additional material
is presented.

Peter Wieck
Wyncote, PA

Power supply probably.

After checking for dry joints and the obvious, change out the smoothing
cap, if it is electrolyic it may have been damaged by reverse
conection. I would just buy a new cap.

-3db
Dave xxxx wrote:
one or more output valves start glowing on and off like buggery,
loudspeakers drivers being thrown fully out and back again, loud pops.
this is happening with or without music playing



ta in advance


Dave

wrote in message
ups.com...

Keith G wrote:

Keith, All:

We are being had. Based on the information we have to-date, the amp
could be partially under water....


Absolutely not, Dave's an 'old friend'....



Any/further speculation should be suspended until additional material
is presented.


Which may take a while, he has 'wellness issues' and goes offline from time
to time. It sounds to me like he's got a bit of rampant voltage somewhere
and I'm wondering what's happening with the power supply....???