I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

"JRUBBO770" wrote in message
...
I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6
push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With
the
three Vol. controls turned all the way down, a moderate signal will still
pass
thru to the output on any channel. What is the cause of this? Also a
signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated.
Please
email at: Thanks

Is this a new problem, or has it always done this?

"JRUBBO770" wrote in message
...
I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6
push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With
the
three Vol. controls turned all the way down, a moderate signal will still
pass
thru to the output on any channel. What is the cause of this? Also a
signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated.
Please
email at: Thanks

Is this a new problem, or has it always done this?

"JRUBBO770" wrote in message
...
I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6
push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With
the
three Vol. controls turned all the way down, a moderate signal will still
pass
thru to the output on any channel. What is the cause of this? Also a
signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated.
Please
email at: Thanks

Is this a new problem, or has it always done this?

JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

Robert Gault wrote in message ...
JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

If this is the amp of which I'm thinking, or a similar model, there is
no circuit board, it's all point to point. Also it's a 3 input single
channel (speaker) output, and I'm not sure if there are 3 separate
pre-amps or just one with 3 potentiometers feeding it. It would
probably be cheaper to replace this unit with something brand new than
to have it worked on if a shop can be found that knows what they're
doing on old tube circuitry, however if the original poster wants to
invest in sentiment and nostalgia I'd start by checking all those half
century old capacitors.

Robert Gault wrote in message ...
JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

If this is the amp of which I'm thinking, or a similar model, there is
no circuit board, it's all point to point. Also it's a 3 input single
channel (speaker) output, and I'm not sure if there are 3 separate
pre-amps or just one with 3 potentiometers feeding it. It would
probably be cheaper to replace this unit with something brand new than
to have it worked on if a shop can be found that knows what they're
doing on old tube circuitry, however if the original poster wants to
invest in sentiment and nostalgia I'd start by checking all those half
century old capacitors.

Robert Gault wrote in message ...
JRUBBO770 wrote:

I have a 1950s Stromberg Carlson PA integrated tube amp with a 2-6L6 push/pull
output. It is a three channel amp each with a Vol. control (1 meg). With the
three Vol. controls turned all the way down, a moderate signal will still pass
thru to the output on any channel. What is the cause of this? Also a signal put
into any channel will bleed thru to the other channels. There are no other
problems with the amp. Your technical help is certainly appreciated. Please
email at: Thanks

Did you buy this amp as new and did it always have this problem? If so
it is a bad design and may not be correctable.

If the problem just started, look for visible signs of change on the
circuit board. Are all tubes in good condition?

What signal can you hear with all volume controls turned off? Is it
source material plugged into the amp or radio frequency interference? If
the sound comes from something plugged into the amp, is any input worse
than the others? Do all channels bleed equally into the others or is
there a worst case setting?

The problem seems to be located after the volume controls in the amp
rather than the preamp section, based on your description. That suggests
bleed through via the power supply. But you need to collect more
information to narrow down the problem to some small group of amp parts.

If this is the amp of which I'm thinking, or a similar model, there is
no circuit board, it's all point to point. Also it's a 3 input single
channel (speaker) output, and I'm not sure if there are 3 separate
pre-amps or just one with 3 potentiometers feeding it. It would
probably be cheaper to replace this unit with something brand new than
to have it worked on if a shop can be found that knows what they're
doing on old tube circuitry, however if the original poster wants to
invest in sentiment and nostalgia I'd start by checking all those half
century old capacitors.