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  1. Replies
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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...
  3. 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...
  15. 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...
  16. Sorry, false start. This one is SPST. 54795 ...

    Sorry, false start. This one is SPST.

    54795

    54796
  17. 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,...
  18. 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.
  20. Reviving this thread because I plan to try this...

    Reviving this thread because I plan to try this on an early USA version Hot Rod Deluxe.

    So, is the recommendation still a 604 ohm in series with C8 and C9 and a 12AY7 in V2? In lieu of a quick...
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    Yep, passing a good clean signal now. Anything...

    Yep, passing a good clean signal now. Anything else to check while I have this cussed thing peeled back?
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    OK, pretty sure I found the issue. It was that...

    OK, pretty sure I found the issue. It was that 6K8uF/10V at V1. Gonna stick in all the preamp tubes and see what kind of signal I can pass.
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    The file is a PDF on my computer but when...

    The file is a PDF on my computer but when uploaded it turns into a gif. I just added a link to the schematic here.

    LINK TO SCHEMATIC
    https://www.schematichell.com/mesaboogie/boogie_nomad45.pdf
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    I do get 6.3CAC on the multiconnector and on all...

    I do get 6.3CAC on the multiconnector and on all tube sockets. I just realized that V1 filaments use DC and not AC as I had assumed.
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    OK, did a quick check of heater voltages. I...

    OK, did a quick check of heater voltages. I measure 3.1 VAC at the molex that connects the PT to the PCB. Downstream, I measure 2.9 VAC on every preamp and power tube (pins 4 & 5) except for V1. ...
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    I pulled the J175 at 2PR3 which connects to the...

    I pulled the J175 at 2PR3 which connects to the SOLO control pot but no change.

    54759


    Pulled and tested the two 220uF/300V main filter caps and they are fine.
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    120Hz hum in Mesa Boogie Nomad 45

    I have a Nomad 45 on the bench with a strong 120Hz hum coming from the speaker. Measured at the output jack to verify 120Hz. Does not respond to volume controls, all controls on front panel are...
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    https://www.thetubestore.com/tung-sol-7581a I...

    https://www.thetubestore.com/tung-sol-7581a

    I tour with a Dumble-circuit amp and have used these tubes for about 5 years. I set idle bias at 25 watts and the power tubes last a couple years. ...
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