Vintage 70's victrola

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  • Uranium-235
    Comrade Glimmer
    • Aug 2007
    • 5042
    • US

    #1

    Vintage 70's victrola

    customer of mine is thinking of buying it. Says it's been sitting in basement for years (arkansas, cool, damp). He says "it tries to turn on"

    so i'm thinking capacitors. I think we have one guy who is a master of these things? Any advise?

    interior pics supposedly coming
    Attached Files
    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
    ^If you have datasheets not listed PM me
  • Uranium-235
    Comrade Glimmer
    • Aug 2007
    • 5042
    • US

    #2
    Re: Vintage 70's victrola

    been unplugged for four years
    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
    ^If you have datasheets not listed PM me

    Comment

    • Uranium-235
      Comrade Glimmer
      • Aug 2007
      • 5042
      • US

      #3
      Re: Vintage 70's victrola

      meh, can someone move this to electronics? I'll probably get more help there
      Cap Datasheet Depot: http://www.paullinebarger.net/DS/
      ^If you have datasheets not listed PM me

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9552
        • Canada

        #4
        Re: Vintage 70's victrola

        These stereos were built well, I doubt it is a cap issue, It uses a linear power supply and if the caps were bad you would here a loud hum, I would suspect oxidized switch contacts and controls.

        Comment

        • Uranium-235
          Comrade Glimmer
          • Aug 2007
          • 5042
          • US

          #5
          Re: Vintage 70's victrola

          he says it hums when it is turned on
          Cap Datasheet Depot: http://www.paullinebarger.net/DS/
          ^If you have datasheets not listed PM me

          Comment

          • Uranium-235
            Comrade Glimmer
            • Aug 2007
            • 5042
            • US

            #6
            Re: Vintage 70's victrola

            "loud hum"
            Cap Datasheet Depot: http://www.paullinebarger.net/DS/
            ^If you have datasheets not listed PM me

            Comment

            • Uranium-235
              Comrade Glimmer
              • Aug 2007
              • 5042
              • US

              #7
              Re: Vintage 70's victrola

              I asked him if the hum changes with volume or changes when switching inputs, so we can narrow pre-amp, ground loop or PSU caps (I did a little reading)
              Cap Datasheet Depot: http://www.paullinebarger.net/DS/
              ^If you have datasheets not listed PM me

              Comment

              • Topcat
                The Boss Stooge
                • Oct 2003
                • 16956
                • United States

                #8
                Re: Vintage 70's victrola

                On older stuff like that, lytics & resistors....with lytics being the number 1 suspect....but over time, resistors will drift far out of spec and cause issues.

                I've always enjoyed tinkering with older stuff like that, usually tube TV's. I was never proficient with them as far as principles (troubleshooting many times consisted of guessing and trial & error)...but they are fun!
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                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 31071
                  • Albion

                  #9
                  Re: Vintage 70's victrola

                  pull out the spindle and lift the rubber deck mat.
                  there will be holes under it - see if it's belt or wheel-drive and if it's fucked!

                  Comment

                  • Uranium-235
                    Comrade Glimmer
                    • Aug 2007
                    • 5042
                    • US

                    #10
                    Re: Vintage 70's victrola

                    I'm doing this blind. It's in arkansas and my customer wonders if I can fix it, we're in texas
                    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                    ^If you have datasheets not listed PM me

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9552
                      • Canada

                      #11
                      Re: Vintage 70's victrola

                      If it hums when he turns it on it will need the power supply cap(s) for sure. It may need others, If you do get it, and you have a scope, thats the best way to find the weak capacitors.
                      I would not be too concerned with the turntable at this point, it will need a complete going over, clean the idler wheel, remove, clean & re-oil motor bushings, clean and lube turntable platter bearing and shaft.
                      Looks like a RCA model: VHT-52W I worked on a many of these but not in a long time. (the caps were not that old then)
                      Last edited by R_J; 04-05-2020, 10:46 AM.

                      Comment

                      • stj
                        Great Sage 齊天大聖
                        • Dec 2009
                        • 31071
                        • Albion

                        #12
                        Re: Vintage 70's victrola

                        if you go to f-droid.com and install the store on your android phone,
                        then browse the store and install the scope, you phone can use it's mic to show waveforms and frequency.
                        handy for checking the hum for 50/60/100/120Hz

                        Comment

                        • Topcat
                          The Boss Stooge
                          • Oct 2003
                          • 16956
                          • United States

                          #13
                          Re: Vintage 70's victrola

                          Main filters in the PSU are the #1 suspect if its an uncontrollable hum.....but something that old, all lytics would be suspect. Can you hear music over/under/with the hum? Like I said, I am not proficient with elderly things like this....but I do love tinkering with them....but trying to fix/diagnose it from another state might be challenging.
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                          • redwire
                            Badcaps Legend
                            • Dec 2010
                            • 3910
                            • Canada

                            #14
                            Re: Vintage 70's victrola

                            It's got FM stereo, RCA New Vista Victrola, Campobello model 1967 VTJ-61 chassis perhaps.
                            Have to look for the chassis number on the back and see if a schematic can be found. I think it would have germanium transistors and surely need re-capping.
                            They put out pretty good, I would add a stealth Bluetooth module for an aux. input or replacement for the phono input.
                            The turntable mechanical would be hardest to fix and a cartridge/needle might
                            be hard to find. I faintly remember they used idler-wheel drive, no belts.

                            Comment

                            • Topcat
                              The Boss Stooge
                              • Oct 2003
                              • 16956
                              • United States

                              #15
                              Re: Vintage 70's victrola

                              Originally posted by redwire
                              ...it would have germanium transistors...
                              I'm ASSuming rather than simply short like modern silicon diodes/transistors (easy to diagnose), these would just become weak & leaky? I'm sure I've encountered these many many moons ago....but that's been many many moons ago...
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                              • Uranium-235
                                Comrade Glimmer
                                • Aug 2007
                                • 5042
                                • US

                                #16
                                Re: Vintage 70's victrola

                                I think the turntable is still working well, but i'll have to specifically ask him
                                Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                                ^If you have datasheets not listed PM me

                                Comment

                                • redwire
                                  Badcaps Legend
                                  • Dec 2010
                                  • 3910
                                  • Canada

                                  #17
                                  Re: Vintage 70's victrola

                                  Originally posted by Topcat
                                  I'm ASSuming rather than simply short like modern silicon diodes/transistors (easy to diagnose), these would just become weak & leaky? I'm sure I've encountered these many many moons ago....but that's been many many moons ago...
                                  It must have some silicon in the tuner to pull off FM radio at 100MHz, but you're right it's easy enough to replace germanium transistors with silicon. The power amplifiers would need the bias circuit changed for the different voltage 0.3V vs 0.7V

                                  Comment

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