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Zenith Allegro stereo - left channel distortion

Discussion in 'Electronic Repair' started by zenithfan, Dec 22, 2003.

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  1. zenithfan

    zenithfan Guest

    Hi all,

    I collect Zenith electronics and just came across a mid 70s vintage Zenith
    Allegro tabletop stereo with a left channel distortion problem. The left
    channel is clear at very low volume, but turn it up and the left channel
    audio gets very choppy and fuzzy. Both speakers work fine on the right
    channel, so it's not them. Just wondering if there is a known easy fix for
    this model I can try or is it time for a professional A/V tech?

    Also, the changer's "Stop/Start/Auto" switch seems to be jammed in the
    "Stop" position. Any tips on that one?

    Appreciate the help. Thanks very much in advance.

  2. Sofie

    Sofie Guest

    Since you have done your detective work and have properly determined that
    both speakers are good then as you have probably surmised, the LEFT channel
    amplifier circuitry has a fault.... most likely leaky, shorted, open, or
    otherwise faulty components such as semiconductors, electrolytics, etc.....
    and possibly faulty or cracked solder connections..... none of these are
    an "easy fix" for the newbie or those who lack repair experience and
    electronics knowledge.... and the proper test equipment and tools.
    Yes, it is probably time to TAKE it to a service shop for a proper repair or
    at the very least a repair cost estimate so you can make an intelligent
    repair decision with facts instead of internet guesses.
  3. John Del

    John Del Guest

    Subject: Zenith Allegro stereo - left channel distortion
    What you have there is one of the last Amercian made (at least affordable)
    stereo systems sold. I sold these back then, and they were bullet proof. The
    original Allegro speakers were an excellent tuned port design and were very

    As Dan pointed out, you have an amplifier problem if the distortion is on all
    inputs (tuner, phono, aux). These weren't the easiest things to service,
    especially the "Wedge" Allegro. Properly repaired, this thing will probably
    last decades longer. The turntable is likely suffering from the lube turning
    into bubble gum. It will have to be disassemble, thoroughly cleaned, and
    relubed. If you're handy, you can probably do this part yourself.

    John Del
    Wolcott, CT

    "I'm just trying to get into heaven, I'm not running for Jesus!"
    Homer Simpson

    (remove S for email reply)
  4. zenithfan

    zenithfan Guest

    Thanks guys for the info. Been wanting one for a few months for my
    collection and couldn't pass this Allegro up for $17 especially since it's
    like new cosmetically (even the dust cover), has a cassette deck (not 8
    track like most) and a neat LED looking tuning dial. Zenith sure made some
    damn good stuff back then.

  5. John Del

    John Del Guest

    Subject: Re: Zenith Allegro stereo - left channel distortion
    .. Zenith sure made some
    At some point however, Zenith started importing these instead of make them
    themselves. The later ones were really crummy. I don't recall if they said
    "Allegro" on them though.

    John Del
    Wolcott, CT

    "I'm just trying to get into heaven, I'm not running for Jesus!"
    Homer Simpson

    (remove S for email reply)
  6. Franbo


    Jan 27, 2010
    Great Sounding System

    I purchased this system new in 1979. It was amazing, the sound it put out. I'd love to get my hands on one, just for the nostalga sake.

    Branford, Ct
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