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  1. I'm not looking at the schematic, but from...

    I'm not looking at the schematic, but from memory, the dropping resistors in the doghouse are different values making the silverface preamp voltages higher. Restoring ALL voltages to AB763 are the...
  2. Yeah, that was a good catch and dodgy pins is not...

    Yeah, that was a good catch and dodgy pins is not something that would have been on my radar.
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    I am just grateful that it doesn't cost me...

    I am just grateful that it doesn't cost me anything to learn from the many hundreds (thousands?) of years of experience that is available to the every day hobbyists/hacks like myself.

    The give and...
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    Call James Demeter and he'll advise best course...

    Call James Demeter and he'll advise best course of action.
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    The reissue Tung Sol is indeed a 23 watt tube,...

    The reissue Tung Sol is indeed a 23 watt tube, NOT 26 watts as I said above. Sorry, I got it mixed up with another 5881 type from memory.

    Bias them about 32 mA
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    Start with the 8 ohm output. The 5881 are...

    Start with the 8 ohm output. The 5881 are similar to 6L6 with regard to reflected impedance they want to "see."
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    EDIT FOR CORRECTION: Bias the reissue Tung Sol...

    EDIT FOR CORRECTION: Bias the reissue Tung Sol 5881 as 23 watt tubes.

    30 - 32 mA is plenty @ 450Vp.
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    Edit: I see you're using a 112 with a Hellatone?...

    Edit: I see you're using a 112 with a Hellatone? Which Hellatone are you using?

    If you brought it to me with those issues, I'd push you toward a pair of 5881s and a Celestion H75 Creamback...
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    I'm a 40 year pro guitarist and run a JTM-45...

    I'm a 40 year pro guitarist and run a JTM-45 regularly that has an 8K OT impedance. I have tried every plausible iteration of octal power tube and made every necessary circuit adjustment (resistors,...
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    If this has been mentioned before then disregard,...

    If this has been mentioned before then disregard, but is the speaker cable plugged into the correct jack? Viewing from back, the main speaker jack is the one on the left.

    If that isn't connected...
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    Seems like the high voltage had a field day in...

    Seems like the high voltage had a field day in places before taking out the power tubes and mains fuse. The one .1 failed open and the other measured excessively high capacitance. Odd thing about...
  12. Weber VST and CE Distribution carry a decent...

    Weber VST and CE Distribution carry a decent range of axial electrolytics. Weber has them to 600 volts

    Weber VST electrolytic capacitors

    CE Distribution electrolytic capacitors
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    OK, got back on the amp this morning (I'm a full...

    OK, got back on the amp this morning (I'm a full time pro musician) and now have it all sorted out.

    NOTE: I have Fluke 8050A and Tenma 1020 benchtop meters and know how to adjust range and how to...
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    Low volume on both input channels Tried fresh...

    Low volume on both input channels
    Tried fresh 12AT7 in V6 phase inverter
    The DC voltages at TP1 (454 Vdc)and TP4 (407 Vdc) are within specs.
    Verified 33 mVdc bias at TP37 and TP38.
    All DC plate...
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    OK, adjusted the input signal to where TP12 (pin...

    OK, adjusted the input signal to where TP12 (pin 2 of V2) was getting 23 mVac.


    Numbers in (parentheses) are expected voltages
    At V2A
    TP12 23mVac (20 mVac) (signal input - pin 2)
    TP14 36 mVac...
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    OK, the charred area(s) cleaned up well with...

    OK, the charred area(s) cleaned up well with acetone then lightly grinding with a Dremel. Replaced all the burned resistors, including all those in the doghouse. When inspecting that area, I found...
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    Just take the black screws from the tube sockets...

    Just take the black screws from the tube sockets and the tube PCB will fold out. Just be gentle. These are standard procedures with these amps, Devilles included.
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    If I have to get deep enough into one that I pull...

    If I have to get deep enough into one that I pull the tube PCB, then I use a desoldering gun and remove all old solder on all tube sockets and then solder all connections as new. On the earlier...
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    All very good information folks. Thank you.

    All very good information folks. Thank you.
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    My original question was, do I need a specific...

    My original question was, do I need a specific sealer or "paint" to seal the affected area, or is removing the charred material enough?

    I thought I remember a discussion awhile back about a...
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    It doesn't go all the way through, and luckily it...

    It doesn't go all the way through, and luckily it is between the traces and solder pads. I've been up since 3 am so I'm gonna wait till morning to break out the Dremel.
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    The burn is on the surface only. I believe I can...

    The burn is on the surface only. I believe I can remove all the bad material and preserve the solder paths. I think.
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    Repairing and sealing burned PCB

    I have a Super Reverb reissue that appears to be a victim of a previous repair. The R60, R61,
    grids, the R62, R63 screens, and R70, R71 heater false center tap 100R resistors are all fried. I...
  24. OK, for what it's worth, the owner preferred the...

    OK, for what it's worth, the owner preferred the 12AX7 in V2 with the drive down lower than the master volume. Both tubes sounded killer, but the 12AX7 suited his tastes. He was astounded at the...
  25. Sorry, false start. This one is SPST. 54795 ...

    Sorry, false start. This one is SPST.

    54795

    54796
  26. OK, I like this mod a lot. It really makes DRIVE...

    OK, I like this mod a lot. It really makes DRIVE and MORE DRIVE much more musical. I tried it with both a 12AX7 and a 12AY7 in V2. Here are my impressions from a guitarist perspective.

    First,...
  27. Got most of the work done. Was already replacing...

    Got most of the work done. Was already replacing all e-caps so figured it was a great time to try this mod. Hope to report back tomorrow some time.
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    Agreed. And as Jazz P Bass said, check the R57...

    Agreed. And as Jazz P Bass said, check the R57 and R58 phase inverter plate resistors on the tube PCB.
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