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  1. Replies
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    The way the pre-amp board is situated this is a...

    The way the pre-amp board is situated this is a tough (for me) board to debug. I have not been able to view the top side of the board when testing. I probably should try to float that board with...
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    Attaching schematic

    Attaching schematic
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    208

    Crate GLX65 Channel Switch Issue

    I have a GLX65 that is stuck on the clean channel.

    Pressing the front panel "SOLO-RHYTHM/CLEAN SELECT" button causes the channel LED lights to switch over to the correct channel but the CLEAN...
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    Spot on. At least half had cold solders. She is...

    Spot on. At least half had cold solders. She is working like a "champion" once again!

    Thank you
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    Fender Champion 300 No Output

    I have a signal on the headphone jack and at pin 10 of the LM3876. No output at pin 3 of LM3876.

    LM3876 pin 1 has +27V, pin 4 should have -27V but there is nothing there.

    I have -27 VDC at C64...
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    Looks like the correct schematic. Thank you!

    Looks like the correct schematic. Thank you!
  7. Replies
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    209

    Fender Champion 300 Schemeatic Needed

    Solid State Type PR 540

    Thank you
  8. Replies
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    290

    That worked!

    That worked!
  9. Replies
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    290

    Interesting. Not sure I have seen a circuit...

    Interesting. Not sure I have seen a circuit where each output tube has its own fused protection. Help me understand what is the general concept here. Thank you
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    Thanks so far. It looks like I am missing some...

    Thanks so far. It looks like I am missing some of the schematic. I do not see any output tubes on the one I have.
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    Crate TV60 Bad Output Transformer?

    Received this Crate TV60 with no tubes and told that it may have a bad OT.

    With all OT wires disconnected, on primary I have continuity from center tap to outer legs, reading 70 ohms and 90...
  12. pictures

    Here are some pics. Odd that one protrudes more.

    55586 55587
  13. Acoustic Control Corp 165 Volume Stacked Dual Concentric Knobs?

    I am missing the pair of stacked volume knobs for this amp. Anyone know where to find some?

    In the meantime I would like to find a substitute or fabricate something.

    Any suggestions? The...
  14. Acoustic Control Corp 164 or 165 Schematic Request

    Can anyone share or point me to this schematic. I have a model 165 which should be the same as the model 164. Thank you!
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    Thank you all and Juan. She is working! Got...

    Thank you all and Juan. She is working! Got through all the steps!

    I am surprised all the pots are working. Got a lot of cleanup to do on those pots, fix the crack on the PA chassis, check/fix...
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    462

    The 15" speaker is good. So. This time I...

    The 15" speaker is good.

    So. This time I tired the amp with no load (no speaker). The bulb limiter did not light up all the way to full AC. Current draw was negligible. I have 43 mVDC on the...
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    462

    My preamp board says "578 C". Let me know if you...

    My preamp board says "578 C". Let me know if you still want me to remove it for a picture.

    I had tested with the speaker connected. Will disconnect speaker and look for DC on the output. Should...
  18. Replies
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    462

    I am seeing the 2N5210 pair. Is that in place of...

    I am seeing the 2N5210 pair. Is that in place of the LM39IN?

    54773
  19. Replies
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    462

    Polytone Mini Brute II (2) Needs Repair

    Picked up a Mini Brute II in sad shape to restore and I could use some guidance.

    First off, I need a schematic, still searching and hope to nail one down.

    After some visual inspection it...
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    Unless it gets bad I am going to go with this is...

    Unless it gets bad I am going to go with this is normal. :)

    Thank you
  21. Replies
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    467

    I do not have freeze spray but I am usinig a can...

    I do not have freeze spray but I am usinig a can of power duster. I believe it has a simialr effect of cooling components. Sprayed every op-amp I could find. No change.

    The hiss is so slight...
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    Kustom 250-1 Hiss, Normal?

    Tihs amp has a low volume hiss, even with volume at zero, guitar plugged in or not plugged in.

    Volume control has no effect on the hiss. As soon as you play you no longer notice the hiss,...
  23. Replies
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    working now

    It is a 1458.

    So, I am scratching my head right now. My squeal is gone. Amp sounds right with good volume to an external speaker. I still need to re-try the original speaker.

    Turns out my...
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    Here is the latest; No ouput now to be heard...

    Here is the latest;

    No ouput now to be heard at speaker, until volume is past 7 and then I hear the squeal. Yet I still see a signal on the scope.

    When it squeals the rails drop by 4 volts...
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    1,705

    Scope pics are at the output with a dummy load. ...

    Scope pics are at the output with a dummy load. I will check the supply when squealing.
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    Will have to check that. Been testing with a...

    Will have to check that. Been testing with a dummy load.
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    Squeal Help!

    I have re-flowed all pots and input jacks.

    Checked every voltage, all are either exact per schematic or very close. One was slightly off, the collector of TR6 states 0.8 on schematic and I read...
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    My latest attempt. This corrected schematic...

    My latest attempt. This corrected schematic represents what I see on my PCB. Hopefully I got it right. If not I will try again.

    All feedback welcome.

    Thank you

    53831
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