Author Topic: Help identifying my console & an issue!  (Read 59 times)


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Help identifying my console & an issue!
« on: March 10, 2018, 08:15:26 PM »
Hello!  First timer here...  picked up a Magnavox from a friend who was moving.  Sounded great for a couple of months while it's been in my possession (my friend hardly ever used it).  But now, having issues with sound out of one set of speakers.  I am certainly not an audiophile nor an expert when it comes to antique electronics but am decently handy and willing to take the time to learn and get this unit sounding great again.  I've really enjoyed pulling out some records (and picking up a few new-to-me!) and dropping them in!  Looking for help!

First, I see the model number is '1P3661'.  I haven't been able to find out the actual name though... thoughts??

Then, second, everything seems to function great - radio and record player.  Like I mentioned, the left speakers do not handle the high pitched sounds anymore (they did the past few months) and come through 'scratchy', for lack of better term.  Thoughts??

I don't know where to start here, but I've been combing this site and feel like I'm in the right place!  Thanks in advance!



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Re: Help identifying my console & an issue!
« Reply #1 on: March 10, 2018, 10:19:38 PM »
It is an Astro-Sonic model from the late 1960s or so.  Solid state.  My suggestion is that you clean all the controls, particularly the external speaker switch and the function switch.  These controls can become electrically "dirty" and can cause all kinds of problems.  It might be a good suggestion to replace all the electrolytic capacitors in the amp and tuner chassis and replace the speaker crossover capacitors.  Good luck.
If it ain't broke, call me.  I can break it....

ed from Baltimore

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Re: Help identifying my console & an issue!
« Reply #2 on: March 10, 2018, 10:57:50 PM »
        This is a treat !   Just saw this  new post with no replies yet so here goes:
         I didn't look up the model number and am hoping its a stereo console with left and right side woofers and left and right front cone or horn tweeters. Treble and bass controls either stepped or continuously variable.   
         If that's the case listen to the FM radio with the tuning dial at a dead spot on the dial, no stations, just a rushing hissing noise. Turn the volume up to hear it well and if there's a squelch control rotate it so that the hiss comes through.
        The side speakers, meaning the low frequency woofers,  should sound alike---no scratchiness as you turn the volume up and down. Place your ear so that you are mainly hearing first one side woofer then the other, and ignore what comes out of the front grill cloth. If the scratchiness is on the left side speaker, rotate the treble control back and forth continuously and see if the scratchiness goes away.  If it improves after  several back and forths you probably had oxidation and dust on the treble control.
         If the two sides  sounded alike, now place your ear close to the front---not side----speaker cloth on the left and then on the right.  If the scratchiness comes from the left front, you may have loose wiring between the left woofer and the left tweeter. Or bad crossover components which are usually tracible between the left tweeter termnals back to the amplifier or the speaker selector switch, if it has one. The voice coil in the tweeter itself may be intermittant.
         There might be other possibilities, like a bad stereo phono  cartridge, but if FM, AM, and phonograph all have the problem, there's not much else it could be----assuming the sound from the side woofers is the same and the bad sound is coming out of the front tweeters.
          If the left woofer and left tweeter both have scratchiness, and the treble control rotation doesn't clear it up, some bad component or loose solder connection in the amplifier or tuner chassis might be reaponsible for intermittant or scratchy treble loss.  But an intermittant tweeter voice coil is most likely.

TC Chris

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Re: Help identifying my console & an issue!
« Reply #3 on: March 10, 2018, 11:31:25 PM »
Remember the old rule about always checking the least complex explanation first.  The simplest explanation (and cheapest fix) for a one-channel loss of high frequencies is the crossover capacitor.  These all have simple high-pass capacitors to feed the tweeters.  Of course, it could be the speaker itself, especially if it has been driven hard by an amp that's distorting, but first check for the crossover caps.

Chris Campbell