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  1. Should the problem recur, if the tube sockets are...

    Should the problem recur, if the tube sockets are directly mounted to the circuit board they could probably use resoldering.
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    Those rubber insulators are sil-pads and do not...

    Those rubber insulators are sil-pads and do not use heatsink grease. Make sure none are nicked or damaged in any way.
    By all means use a variac or dim bulb and power up with no load until you...
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    Yes, it is quite common in this series of Fender....

    Yes, it is quite common in this series of Fender. Resolder both those 5W resistors and both those zeners. Check to make sure the pads are not broken from the traces.
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    That's the bias supply rectifier, not a zener so...

    That's the bias supply rectifier, not a zener so another UF4007 will be fine there.
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    Also, where does the OT get it's supply from, the...

    Also, where does the OT get it's supply from, the same node as the screens? With no common dropper resistor between the OT and screen feeds?
    As you mentioned, disconnecting one of the 100uF's would...
  6. If so, I would look to the first tube stage...

    If so, I would look to the first tube stage (V1a), possibly it's plate resistor, shown as R4 on the HBb schematic.

    But before even that, it's not clear if tube V1 has been replaced, if not, it is...
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    Nice work, I find it hard to make tight circles...

    Nice work, I find it hard to make tight circles like that so you must have some pretty fine needlenose.
    Agree with Chuck to either secure (glue) on the ribbon side, or secure your jumpers. Those...
  8. Sounds like maybe the OT phase is backwards?...

    Sounds like maybe the OT phase is backwards?
    Without schematic I can't really guess why it wouldn't do same feedback in triode mode, but maybe others more familiar with that mode could say.
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    According to what DrGonz posted there may not be...

    According to what DrGonz posted there may not be any wires at those 3 posts unless it's an export version.
    So possible the wires go elsewhere. Do you have wires at J13,J22, & J23 ?
  10. https://gitlab.com/jofirel/uterror-amp/-/archive/m...

    https://gitlab.com/jofirel/uterror-amp/-/archive/master/uterror-amp-master.zip
  11. I don't see a schematic anywhere for this...

    I don't see a schematic anywhere for this particular HR version. So using other schematics is not going to work well unless you are a fairly experienced tech. What is your experience level?
    Do you...
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    That's true but sometimes it's shown much smaller...

    That's true but sometimes it's shown much smaller than the digits. I have the same problem with mine, I can see the numbers from across the bench, but I can't see the units without having it right...
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    That's an error. The voltages on the layout...

    That's an error. The voltages on the layout drawing shown for C35 & C42 should be shown at C45 & C46.
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    Agree. Old style "F" would be like modern AB...

    Agree. Old style "F" would be like modern AB impedance code. Old style "C" would be like modern FB or EB if FB not available.
    Fliptops has a MOD brand sub for the type "C" which has been altered...
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    That's what I thought too, but: ...

    That's what I thought too, but: https://www.mouser.com/Passive-Components/Resistors/_/N-5g9n?P=1z0vknw
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    Can you post some pictures of the amp board and...

    Can you post some pictures of the amp board and wiring?
  17. Ok, I mentioned that for the cases where the cap...

    Ok, I mentioned that for the cases where the cap fix doesn't get rid of it all.
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    What you said about them demo-ing it in front of...

    What you said about them demo-ing it in front of you is good so you can say that they saw it was in working order.
  19. Both schematics can be compared, pg.4 & 5 of this...

    Both schematics can be compared, pg.4 & 5 of this pdf
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    Gig-ohms huh, new one on me. I'm still caught...

    Gig-ohms huh, new one on me. I'm still caught out occasionally with milli-farads, I can get away with it, but it's not a good look for a high end cap dealer to not be able to keep their ufd and mfd...
  21. Agree with Helmholtz that the circuit could...

    Agree with Helmholtz that the circuit could 'accidentally' help prevent oscillations above 16khz so keep this in mind if anything weird happens with it gone.
    As a side note, since you just worked...
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    Yes and yes. With the clips to 1/4" jack you...

    Yes and yes. With the clips to 1/4" jack you lose some shielding you would have with a real cable, but this is just for testing, not usage.
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    That's them, thank you!

    That's them, thank you!
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    I like picking up the ultra-cheapies ($10 range)...

    I like picking up the ultra-cheapies ($10 range) to leave everywhere I might need one, like family and friend's places where they are always asking 'do you know what might be wrong with...?'. So...
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    Check the plate voltages on the PI tube. One of...

    Check the plate voltages on the PI tube. One of the resistors for the PI plates may have opened.
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    There is a big difference between an electric...

    There is a big difference between an electric drill and a real cordless screwdriver. Not sure which you are all speaking of.
    My cordless screwdriver has a lock, so I can manually start the screws,...
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    Now that would have me hurling. Such a fine line...

    Now that would have me hurling. Such a fine line between patriotic and abomination. ;)
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    Like this. Not for heatsinking. ;) ...

    Like this. Not for heatsinking. ;)

    https://music-electronics-forum.com/attachment.php?attachmentid=56657&d=1579116054
    56657
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