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  1. I feel I should note - it's really not uncommon...

    I feel I should note - it's really not uncommon for the plate resistors in the Hot Rods to end up WAY out of spec. I've seen it more often than I care to count.
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    Ah, good shout. I'll take a look.

    Ah, good shout. I'll take a look.
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    That red ended wire is the negative feedback...

    That red ended wire is the negative feedback connection. If you're getting oscillation it means the output transformer primary is backwards.
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    Hot Rod Deluxe - oscillating reverb

    Hi all, got an old (1997) HRD on my bench at the moment. Everything is now working properly except now turning up the reverb control to anything beyond "off" is causing high pitched oscillation. The...
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    Not for nothing, but none of this was helpful -...

    Not for nothing, but none of this was helpful - this is the stuff I found on Google and it's not useful.
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    Krank Rev1 Schematic needed

    Hi all, I've got a Krank Rev1 on my bench that's had a lot of work done to it, and badly - in addition to a blown up tube socket and output section PCB. Anyone got a schematic? Google's been no help...
  7. I would agree, it sounds to me like you're losing...

    I would agree, it sounds to me like you're losing ground reference somewhere.
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    EDIT: Actually, a thought. These amps have...

    EDIT: Actually, a thought. These amps have Flyback prevention diodes. I wonder if they've gone conductive?
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    Oh, the infamous 5150 volume drop. Check the...

    Oh, the infamous 5150 volume drop. Check the ribbon cable attaching the power tube board to the main board.
  10. MXR M-125 31 band Graphic EQ (blue face, rack mount)

    Hi all. I've looked everywhere for a schematic of one of these and I haven't found anything. Any of you have one?

    Thanks!
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    Peavey 6505MH schematic

    Friend's got one and I need to figure out which part is causing the thermal shutdowns... And also I'm curious.

    Thanks!
  12. Thank you!

    Thank you!
  13. Looking for a Madison Divinity 100/Smarvo VS100 schematic

    Title says it all, I hear these are closely based on a JCM2000 DSL100. I've got one in for service and need to know what does what.
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