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  • SoulFetish
    replied
    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.

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  • vintagekiki
    replied
    Crate GTD120-212

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

    DrGonz78



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  • vintagekiki
    replied
    Crate schematics

    http://schems.com/bmampscom/crate/

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  • vintagekiki
    replied
    Crate GX-15R

    https://music-electronics-forum.com/attachment.php?attachmentid=44427&d=1502246647
    DrGonz78

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  • vintagekiki
    replied
    Crate CR-45

    https://music-electronics-forum.com/attachment.php?attachmentid=50990&d=1541221195
    Jazz P Bass
    Last edited by vintagekiki; 09-24-2019, 12:12 AM. Reason: Edit Title

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  • vintagekiki
    replied
    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, 02:54 PM. Reason: 1)

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  • gary rabbitt
    replied
    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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  • vintagekiki
    replied
    Crate schematics

    http://www.eserviceinfo.com/index.php?what=search2&searchstring=Crate

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  • Jazz P Bass
    replied
    Silipads by themselves are fine.

    No need for the grease.

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  • gary rabbitt
    replied
    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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  • gary rabbitt
    replied
    Thanks Dr. Gonz,
    Yes I WILL use the dim bulb tester (Standard practice on the vintage radios I do).
    I have a Variac and Ammeter too. I don't see a relay in the power supply, so that's not an issue.
    Parts should be here tomorrow or Saturday. Will keep you informed.
    Thanks!

    Leave a comment:


  • DrGonz78
    replied
    Originally posted by gary rabbitt View Post
    Upon powerup, I may use the dim bulb, in the rare case something else is shorted, but I am pretty confident the amp will work.
    Edit that statement to say... "Upon powerup, I WILL use the dim bulb, in the rare case something else is shorted, but I am pretty confident the amp will work."

    Variacs with ammeter will work too, but sometimes the amp will have a relay that kicks on after about 90VAC or so. I have a few of those confident moments where I started the amp up and the light bulb was still shinning bright. Better safe than sorry.

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  • gary rabbitt
    replied
    Hi guys,
    Just an update on the BFX100. I finally got it on the bench. Recitifier bridge, caps and supporting parts tested ok in the power supply. I went right to the MOSFETS, both were shorted. Supporting parts on the small power amp board were fine.
    A member here told me that he would have like to see Crate use a larger heat sink on them.
    Parts ordered from Mouser should be here this week.
    Upon powerup, I may use the dim bulb, in the rare case something else is shorted, but I am pretty confident the amp will work.

    Another note, I found a few fractured solder pads on the main board, and the 10 pin connector to the main amp board. I've see these fractures on many home theater systems, especially on large resistors, and amp modules.
    Thanks and will let you know what happens.
    Click image for larger version

Name:	fracture.JPG
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ID:	841058

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  • gary rabbitt
    replied
    Good links for those that have not used or heard of a Dim Bulb Tester. I've been a member of the ARF for many years, and the DBT is one of the first piece if equipment we recommend. Some get fancy with building one, others build it simple.
    If your equipment has a short, the bulb will light brightly, protecting your equipment.

    Leave a comment:


  • vintagekiki
    replied
    reminder for beginners and those who are not

    http://antiqueradio.org/dimbulb.htm

    http://www.cab1net.com/forum/viewtopic.php?f=59&t=1018

    Leave a comment:

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