Triplett 630 VOM

Triplett 630-APLK classic analog VOM

8 Responses to Triplett 630 VOM

  1. harvey says:

    I hadnt noticed this one before, perhaps im blind lol 🙂

    That looks on par with the old avo 8 or similar, i love the wheel of resistors, what an unusual way to do it, very well insulated from each other, very nice 😉

    When you did the 5v test did you gently tap the case with a finger, my old avo 8 allways settles to a slightly higher value, it may be much more accurate than the test shows.

    Smashing vom, ive never seen one like that before, thanks 🙂

    • modemhead says:

      Oh yes, my first bit of test equipment was a Micronta VOM, so tapping on the meter face became a habit. But the taut band movement in this Triplett pretty much eliminates that stickiness from jeweled movements.

      You may have heard of the famous Simpson 260 VOM (pretty much a standard here in the States, like AVO in the UK). The Triplett 630 was a contemporary and a worthy competitor. Easier to use in my mind, but then again I could only afford the Radio Shack stuff at the time.

      • Harvey says:

        Oh yes, i found a site for the Simpson Vom’s, the outward design seems to stay much the same over the years and thats great as you learn one and you know nearly every model 🙂

        The earlier Simpsons i like better, the white printing and overall look just appeals to me 🙂

        This old avo8 mk2 was given to me in a broken state, no glass, glued case (so it was dropped) and the scale just didnt line up in a linear way, after checking every part i found a small moveable bar bolted to the side of the movement, i just had to move it a little lol, after adjustment the linearity came back and all modes had a decent accuracy 🙂

        Im sure you know exactly what i was tampering with, i didnt lol.

  2. LDSisHere says:

    I do not have any real experience with analog meters so what stands out to me is that I do not see a PCB. (I do not count the current shunt.) It is very interesting to look at how it was made.

    I am curious about the purpose, if there is one, of the mirror behind the needle. If someone could take the time to enlighten me I would appreciate it.

  3. PatH says:


    My 630 has a loose switch assembly. Everything turns and nothing seems broken, but I can’t figure out how to get the red button off. Any ideas?

    • modemhead says:

      If you’re referring to the red selector knob on the front, mine just pulls off of a flatted 1/4-inch shaft, with a little spring-metal insert providing the grip. The nut on the shaft looks like it might require some pin pliers, a lens wrench or somesuch to tighten it.

  4. Estudo eletronica e estou em fase do término do curso,e gostaria de poder ter a chance que meu falecido Pai teve,trabalhar com um V-O-M-
    Triplett 630- ou o modelo V-O-M-800 por esta razão solicito informações sobre a compra e forma de pagamento, ou uma doação ( pode ser usado e não precisa estar funcionando,só precisa estar em bom estado,aqui darei o meu jeito, ),me ajudem se puderem,agradeço pela atenção recebida ficando no
    aguardo e segue o meu muito obrigado desta tão conceituada organização.

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