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Mitsubishi LT-5V, calling all vertical Mitsubishi TT owners!

Discussion in 'Turntables' started by meatpants, May 16, 2018.

  1. meatpants

    meatpants New Member

    Messages:
    22
    I've been reading up on my LT-5V as much as possible and I was hoping someone could give me a hand. I have most everything sorted out but I just need some help with a couple of things.

    1. Replacement bulb types and sourcing. Links to the bulbs in previous threads are dead and I've read seen folks mention 2 different type of bulbs that seem quite different. 3mm 12v 50mA lamps, and also 3mm 6v 5mA lamps. I'm not too sure which I should try and source.

    2. The prism light, the light on the plexiglass "Prism" that shines on the platter to sense the record size turns on when the power to the unit is turned on, them randomly turns off, then on for a while. If someone has had a similar issue, or could offer up some advice on where to start, that would be fantastic

    Thanks for your time!
     

     

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  2. Montycat

    Montycat AK Subscriber Subscriber

    Messages:
    17,127
    Location:
    Vancouver
    LEDs work great. I used them in a Mitsu a few years ago. The tricky part was making them fit with a resistor soldered to one lead but there are some on eBay and elsewhere with the resistors already attached and coveted in heatshrink.

    Measure the voltage at the bulbs or check the SM. I don't recall offhand what it was but choose voltage accordingly.
     
  3. MRL_Audio

    MRL_Audio AK Subscriber Subscriber

    Messages:
    5,726
    Location:
    St. Chuck, MO
    :lurk: on the prism issue...
     
    Last edited: May 17, 2018
  4. meatpants

    meatpants New Member

    Messages:
    22
    I had a look in the service manual, but I don't think the values are listed. I know how to to test for voltage but not sure how to figure out mA rating? Sorry if I have the terms incorrect.

     
    Last edited: May 16, 2018
  5. Montycat

    Montycat AK Subscriber Subscriber

    Messages:
    17,127
    Location:
    Vancouver
    5ma sounds too low; I am not sure that rating is even available in light bulbs. 30 to 50 is more likely. I'll do some more research latet
     
  6. Montycat

    Montycat AK Subscriber Subscriber

    Messages:
    17,127
    Location:
    Vancouver

     

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  7. ETI_5000

    ETI_5000 Super Member

    Messages:
    2,829
    Location:
    Hobart, Tasmania, Australia
    Incidentally, one of the good things about that turntable is because it was vertical, it was much more immune to acoustic feedback-related sound 'blurring' than horizontal turntables, as the vibrations from speakers travelling up through furniture into the turntable tend to be mainly vertical in nature, and don’t affect the vertical tonearm and cartridge as much as with horizontal tonearms!:thumbsup:
     
  8. meatpants

    meatpants New Member

    Messages:
    22
    Thank you sir, I just have one lamp in the arm to replace and this would be very helpful.
     
  9. meatpants

    meatpants New Member

    Messages:
    22
    I tracked down the issue with the intermittent prism lamp on the exterior that sense record size and speed. Turns out it was a bad solder on one of the lamp bulbs, nice and easy fix.

    Other than tracking down a tone arm bulb, I just have one last problem, which is the standard thumping vibration that's I read is caused by not enough pressure from the clamp. I've stretched out the spring on my clamp and that certainly helps but the issue still rears it's head now and then. I've read that folks have added some more material to end of the clamp with puts more pressure on the record and this stops the thumping.

    If anyone has any pics of what they used and how they attached it to the clamp, that would be pretty fantastic.
     
  10. Thunderbox

    Thunderbox Well-Known Member

    Messages:
    558
    Location:
    Saskatoon, Saskatchewan
    Check the solder joints on the board going to the lamp. I had the same problem the lite was intermittent.
     
  11. meatpants

    meatpants New Member

    Messages:
    22
    Yes thanks, I did eventually find the bad solder and fix that up, now just need to address the thumping issue that plagues these decks.
     

     

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  12. jcidave

    jcidave Member

    Messages:
    79
    Location:
    Williamsburg, VA
    Meatpants: I got some very thin cork sheet and thin rubber sheet. Like gasket material. Don't know where you are located, but mine came from ACE hardware. Cut a disc for my LT 640 and held it on with double sticky tape. Not sophisticated, but it works. Must be very thin or the clamp wont catch. My 5V is working OK without it.
     

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