I was looking at the notes on the Bexdix 110
http://www.nostalgiaair.org/PagesByModel/317/M0002317.pdf
...and they say that certain models had changes to the audio circuit where a "coupling plate" has been added between the 12sq7 and the 50l6 in lieu of the plate load resistor, plate rf bypas cap and the grid resistor.
What is this?
How can you eliminate all those parts?...
Is it just a device that has all those parts in one module?

Hi Peter

A small ceramic printed circuit with resistors and capacitors. They were used between 1st audio stage and audio output.

Values of components are already shown on your schematic so not a problem if the unit has to be replaced.

One of the most polular was PC-70. It had plate resistor of 1st audio, grid resistor on output stage, coupling cap and some small bypass caps.

Norm

:I was looking at the notes on the Bexdix 110
:http://www.nostalgiaair.org/PagesByModel/317/M0002317.pdf
:...and they say that certain models had changes to the audio circuit where a "coupling plate" has been added between the 12sq7 and the 50l6 in lieu of the plate load resistor, plate rf bypas cap and the grid resistor.
:What is this?
:How can you eliminate all those parts?...
:Is it just a device that has all those parts in one module?

:Hi Peter
:
: A small ceramic printed circuit with resistors and capacitors. They were used between 1st audio stage and audio output.
:
: Values of components are already shown on your schematic so not a problem if the unit has to be replaced.
:
: One of the most polular was PC-70. It had plate resistor of 1st audio, grid resistor on output stage, coupling cap and some small bypass caps.
:
:Norm
:
:
::I was looking at the notes on the Bexdix 110
::http://www.nostalgiaair.org/PagesByModel/317/M0002317.pdf
::...and they say that certain models had changes to the audio circuit where a "coupling plate" has been added between the 12sq7 and the 50l6 in lieu of the plate load resistor, plate rf bypas cap and the grid resistor.
::What is this?
::How can you eliminate all those parts?...
::Is it just a device that has all those parts in one module?

Norm:

Right on! Centralab was a pioneer in what later was to be known as hybrid circuits. I think this might have been one of the first uses of printed resistors.

Rich

:Hi Peter
:
: A small ceramic printed circuit with resistors and capacitors. They were used between 1st audio stage and audio output.
:
: Values of components are already shown on your schematic so not a problem if the unit has to be replaced.
:
: One of the most polular was PC-70. It had plate resistor of 1st audio, grid resistor on output stage, coupling cap and some small bypass caps.
:
:Norm
:
:
::I was looking at the notes on the Bexdix 110
::http://www.nostalgiaair.org/PagesByModel/317/M0002317.pdf
::...and they say that certain models had changes to the audio circuit where a "coupling plate" has been added between the 12sq7 and the 50l6 in lieu of the plate load resistor, plate rf bypas cap and the grid resistor.
::What is this?
::How can you eliminate all those parts?...
::Is it just a device that has all those parts in one module?

&&&&&&&&&&&&&&&&

For more info on Centralab couplers, check out:

http://www.peacockcollectibles.com/radios2/radios3/pec.htm

Rich

I kinda thought it was something like that.
It's so nice to have so many guys with so much knowledge able to come up with answers so quickly. Thanks yoooz guys..
Ahhhh... and now I see... now that I look at these pictures of them I remember seeing them here and there.
Weren't they also used a lot in TVs too?
... for some reason that is somehow where I think I used to see them years ago.

:I kinda thought it was something like that.
:It's so nice to have so many guys with so much knowledge able to come up with answers so quickly. Thanks yoooz guys..
:Ahhhh... and now I see... now that I look at these pictures of them I remember seeing them here and there.
:Weren't they also used a lot in TVs too?
:... for some reason that is somehow where I think I used to see them years ago.

BOY, you had me going there with that two worded version "coupling plate" there for a minute 'til you zeroed in on its function/location. I had only referred to it as a couplate which I believe one manufacturer opted to assign to it. Fortunately most references also gave its internal wiring/component complement for our troubleshooting...or so that we could replicate the device if desired.
Yes, it was also common to be found in old TV's , in their vert integrator, sync separator, as well as its hoz circuitry. Maybe even using a simple R/C pair up in the tuner input circuitry as well as hi megohm chassis ground isolation.
73's de Edd

Yes weird naming I guess... but I was quoting from the actual verbage used on the print... take a look at the notes section for model 110.

http://www.nostalgiaair.org/PagesByModel/317/M0002317.pdf