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AR Stereo Receiver Center-Tuned Meter

I have a very-early run AR Receiver, from the serial number amongst
the first 100 made (model W before being called the Model R), or so.
In any case, the center-tuned meter has crapped out... or better it
should be described as mangled during a previous repair attempt. I
have done all the other necessary repairs (to suggest that this unit
was "previously enjoyed" is only a modest understatement) but now I
want to replace the meter.

It appears to operate from approximately -1V - +1V. Off-station is
0V.The visible dimension is just under 1/2" by just under 1". The
entire meter is just over 1" square.I use approximations as the mask
can be made larger or smaller, and there is some room "in back" for a
slightly larger meter in all dimensions. The meter has no internal
lighting and the back-lit device is intact. The receiver has a Gorler
(as opposed to Waller) front-end if that makes any difference.

Where would I find such a beast? AR themselves used a few slightly
different meters over the years, all being Center-Tuned. Is there a
supplier to the aftermarket? This is the first time I have ever had a
bad meter on one of these.

Thanks in advance,

Peter Wieck
Wyncote, PA
 
A

Arfa Daily

Jan 1, 1970
0
I have a very-early run AR Receiver, from the serial number amongst
the first 100 made (model W before being called the Model R), or so.
In any case, the center-tuned meter has crapped out... or better it
should be described as mangled during a previous repair attempt. I
have done all the other necessary repairs (to suggest that this unit
was "previously enjoyed" is only a modest understatement) but now I
want to replace the meter.

It appears to operate from approximately -1V - +1V. Off-station is
0V.The visible dimension is just under 1/2" by just under 1". The
entire meter is just over 1" square.I use approximations as the mask
can be made larger or smaller, and there is some room "in back" for a
slightly larger meter in all dimensions. The meter has no internal
lighting and the back-lit device is intact. The receiver has a Gorler
(as opposed to Waller) front-end if that makes any difference.

Where would I find such a beast? AR themselves used a few slightly
different meters over the years, all being Center-Tuned. Is there a
supplier to the aftermarket? This is the first time I have ever had a
bad meter on one of these.

Thanks in advance,

Peter Wieck
Wyncote, PA

Hi Peter. Such items are certainly available. I bought one here recently
when I was flinging together a bias checking box for Fender amps. It is used
to set the tube balance. I got mine from Farnell www.farnell.com
under part number 143510. I'm sure such an item must be available from
similar suppliers in the US, but if you get really stuck, Farnell do export,
but whether there is a minimum order or whether the shipping would be worth
it, I don't know.

Arfa
 
Hi Peter. Such items are certainly available. I bought one here recently
when I was flinging together a bias checking box for Fender amps. It is used
to set the tube balance. I got mine from Farnell www.farnell.com
under part number 143510. I'm sure such an item must be available from
similar suppliers in the US, but if you get really stuck, Farnell do export,
but whether there is a minimum order or whether the shipping would be worth
it, I don't know.

Arfa- Hide quoted text -

- Show quoted text -

Many thanks! I can adapt an ammeter to this use, so if all else fails,
that is what I will do.

Peter Wieck
Wyncote, PA
 
A

Arfa Daily

Jan 1, 1970
0
Many thanks! I can adapt an ammeter to this use, so if all else fails,
that is what I will do.

Yes indeed. All moving coil meters are in fact ammeters. Whether they read
amps or volts is purely down to how you shunt or series them with
resistance. For the meter that I pointed you to, a series R of about 8k2
would be needed to make it read + / - 1V

Arfa
 
Yes indeed. All moving coil meters are in fact ammeters. Whether they read
amps or volts is purely down to how you shunt or series them with
resistance. For the meter that I pointed you to, a series R of about 8k2
would be needed to make it read + / - 1V

Arfa- Hide quoted text -

- Show quoted text -

Found the almost the same meter on this side of the pond. $10 w/
shipping. Slightly smaller (a good thing), same ratings. It helped to
know what to call it. When it arrives, I will test several resistor
values so as to make it function correctly under various actual use
conditions. the +/- voltage was as read by my Fluke with two damp
fingers on the antenna lead. So, with a real antenna connected,
readings may be different.

Thanks again for the tip.

Peter Wieck
Wyncote, PA
 
A

Arfa Daily

Jan 1, 1970
0
Found the almost the same meter on this side of the pond. $10 w/
shipping. Slightly smaller (a good thing), same ratings. It helped to
know what to call it. When it arrives, I will test several resistor
values so as to make it function correctly under various actual use
conditions. the +/- voltage was as read by my Fluke with two damp
fingers on the antenna lead. So, with a real antenna connected,
readings may be different.

Thanks again for the tip.

Peter Wieck
Wyncote, PA

You're very welcome. Glad you found an equivalent, and hope it works out OK.
You could always fit a preset pot of say 20k, wired as a variable resistor,
(one end shorted to the wiper) in series with the meter. That way, you can
set a full scale reading that suits that particular meter, in that
particular application.

Arfa
 
Update:

The meter arrived last night and immediately went into the receiver. I
had to clip the screw-tabs, but that was the only physical
modification required to the meter or the receiver. A bit of hot-melt
glue on the remaining flange was all it took for a neat, centered
installation.

It turned out that the meter responded correctly without the need for
a series-resistor, my suspicions to that end were aroused when I saw
that that solder-tabs were polarized. In any case, with a proper
antenna it does exactly what it should do, and reads 'center' exactly
where it should as well.

Thanks again for the tip, I may order a couple more to hold in the
spares-box.

Peter Wieck
Wyncote, PA
 
A

Arfa Daily

Jan 1, 1970
0
Update:

The meter arrived last night and immediately went into the receiver. I
had to clip the screw-tabs, but that was the only physical
modification required to the meter or the receiver. A bit of hot-melt
glue on the remaining flange was all it took for a neat, centered
installation.

It turned out that the meter responded correctly without the need for
a series-resistor, my suspicions to that end were aroused when I saw
that that solder-tabs were polarized. In any case, with a proper
antenna it does exactly what it should do, and reads 'center' exactly
where it should as well.

Thanks again for the tip, I may order a couple more to hold in the
spares-box.

Peter Wieck
Wyncote, PA

Glad you got a fix, and it turned out to be so simple in the end. Thanks for
taking the time and trouble to post back and let us all know the outcome.
Always nice to see a thread through to its conclusion.

Arfa
 
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