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Premier 88 tremolo not working

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  • #1

    Premier 88 tremolo not working

    Yet another Premier, this time the '88'. THese are such a pain to work on. They all seem to be different.
    I hope someone can shed some light on this: the going schematic on the web is below.
    To me it seems that this drawing will not work, but of course I could be wrong.
    The cathode is not in the usually configuration. I would expect that it would either go to ground or
    have a resistor to ground.
    Does anyone have any ideas?
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  • #2
    Originally posted by pontiacpete View Post
    The cathode is not in the usually configuration. I would expect that it would either go to ground or
    have a resistor to ground.
    Uhmm.

    Which cathode??????

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    • #3
      It's the cathode of the the 6AU6. I connects to G3 of the pentode which is pin 7 and 1. They are connected. But if you look at the drawing i posted the last picture shows the connection of pin 1 to the 'trem' and between the 1.5k and the 470k. This is what seems odd.

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      • #4
        Sorry, didn't see that last page... anybody care to redraw that as a schematic, instead of a mishmash of schem/layout? :grin:

        Justin
        "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
        "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
        "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

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        • #5
          I'm trying to avoid that, but it might be necessary.

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          • #6
            Got the tremolo working. Searched around for another amp with a 6AU6 trem and found that the silvertone 1482 has one, and it's surprisingly similar, but there are definitely problems with '88' drawing. Although the cathode complaint I had, wasn't the problem at all.
            On the grid there's a 1.5k, I upped that to a 2.2m. On the screen there was a 680K changed that to 330k and moved it to ground and then added in a .5uf cap in parallel, that is what brought the tremolo back.

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            • #7
              I do not think that the posted schematic/ assembly drawing is 'factory'.

              Comment

              • #8
                That shows you how to build one, but doesn't reveal much about the circuit.
                Education is what you're left with after you have forgotten what you have learned.

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                • #9
                  Does your circuit appear to be stock in the amplifier?

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                  • #10
                    It had some similarities to the above drawing, but also very different. I wonder if a this amp was intended to have a different pentode.
                    Someone before me changed out the 3 oscillator caps, the .02ufs. Who knows what else was taken out.

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