Connect with us

AR Stereo Receiver Center-Tuned Meter

Discussion in 'Electronic Repair' started by [email protected], Mar 26, 2007.

Scroll to continue with content
  1. Guest

    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
     
  2. Arfa Daily

    Arfa Daily Guest

    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
     
  3. Guest

    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
     
  4. Arfa Daily

    Arfa Daily Guest

    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
     
  5. Guest

    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
     
  6. Arfa Daily

    Arfa Daily Guest

    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
     
  7. Guest

    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
     
  8. Arfa Daily

    Arfa Daily Guest

    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
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-