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  • #31
    Hi guys,
    Just an update. I replaced the MOSFETS, as both were totally shorted. All other parts checked out ok.
    Powered up after the dim bulb check, Variac started to hear audio. Full voltage, a brief test it was functioning good.
    I set the bias adjustment per specs on the schematic. All voltages looked on spec.

    It sounds great, the effects functions as it should.
    One thing I noted, it did not use thermal paste on the MOSFETS. Paste was only used on a small transistor held down by the heat sink>
    The MOSFET used 'Si pads', which I read it was not recommended that thermal paste to be used. The parts did not get hot at all after 1/2 hour of being powered up.
    Thanks to all that gave he help on this amp, it's really appreciated.
    If any of you all ever need a diagram or help with a vintage radio, give me a shout.
    Take care, Gary.

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    • #32
      Silipads by themselves are fine.

      No need for the grease.

      Comment


      • #33
        Crate schematics

        http://www.eserviceinfo.com/index.php?what=search2&searchstring=Crate
        Who does not know and knows that he does not know - teach him Confucius)
        Who knows and does not know that he knows - wake him Confucius)

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        • #34
          Thank you Kiki, Unfortunately the EService page didn't have the model I needed at the time. I was able to get the diagrams from another member, and I subsequently repaired the amp. Still working fine after replacing the MOSFETS that were all shorted. I usually check Eservice as sometimes they will have diagrams on other things I work on.They are a good resource.

          Appreciate the reply though, have a great evening!
          Gary.

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          • #35
            Links to Crate schematics

            http://bee.mif.pg.gda.pl/ciasteczkowypotwor/SM_scena/Crate/

            http://bee.mif.pg.gda.pl/ciasteczkowypotwor/%23SM_scena/Crate/ 1)
            Last edited by vintagekiki; 08-23-2020, 01:54 PM. Reason: 1)
            Who does not know and knows that he does not know - teach him Confucius)
            Who knows and does not know that he knows - wake him Confucius)

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            • #36
              Crate CR-45

              https://music-electronics-forum.com/attachment.php?attachmentid=50990&d=1541221195
              Jazz P Bass
              Last edited by vintagekiki; 09-23-2019, 11:12 PM. Reason: Edit Title
              Who does not know and knows that he does not know - teach him Confucius)
              Who knows and does not know that he knows - wake him Confucius)

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              • #37
                Crate GX-15R

                https://music-electronics-forum.com/attachment.php?attachmentid=44427&d=1502246647
                DrGonz78
                Who does not know and knows that he does not know - teach him Confucius)
                Who knows and does not know that he knows - wake him Confucius)

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                • #38
                  Crate schematics

                  http://schems.com/bmampscom/crate/
                  Who does not know and knows that he does not know - teach him Confucius)
                  Who knows and does not know that he knows - wake him Confucius)

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                  • #39
                    Crate GTD120-212

                    https://music-electronics-forum.com/filedata/fetch?id=912574&d=1599075090

                    DrGonz78



                    Who does not know and knows that he does not know - teach him Confucius)
                    Who knows and does not know that he knows - wake him Confucius)

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                    • #40
                      I have a complete schematic for the Crate V30 3112 amp, including power transformer data for both import and export models. I combined them into a single PDF file.
                      Maybe bmamps would find it a helpful addition to the hosted schematic archive.

                      Crate V30 - 3112 schematic & transformer.pdf

                      The one caveat is that some of the text was rasterized and low resolution. So, I ran it through an OCR and exported the text to reformat it quickly in illustrator. Sometimes this causes character errors. I corrected the ones that I saw, but if you catch any others, the text should be editable in Acrobat without affecting any of the other graphics.
                      If I have a 50% chance of guessing the right answer, I guess wrong 80% of the time.

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