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    Ah! OK, my bad Helmholtz and greengriff. I was...

    Ah! OK, my bad Helmholtz and greengriff. I was looking at the 50W model when I determined the value for R8 And didn't notice that the 100W has a dedicated bias winding. Please proceed gentlemen. I'll...
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    Does this amp have an HT fuse? If so, which fuse...

    Does this amp have an HT fuse? If so, which fuse is blowing? If it doesn't and this is the mains fuse then the fuse popping would indicate excessive current draw. That could be an intermittent bias...
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    Also, the piggyback resistor is almost ubiquitous...

    Also, the piggyback resistor is almost ubiquitous here in the US where tens of thousands of 6550 Marshalls have been converted to use EL34's. Care must be taken not to unsolder the existing resistor...
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    If your bias supply is taken from the HT winding...

    If your bias supply is taken from the HT winding then the bias feed resistor should NOT be 27k for UK models. It should be 220k. It is R8 in the schematic that Helmholtz posted. Which is the one I...
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    There is another resistor for the bias supply...

    There is another resistor for the bias supply just off the rectifier (schematically speaking) that forms a voltage division with the bias trim pot. In the 6550 model it's 120k. In the EL34 model it's...
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    The forum lost a lot of documents in an...

    The forum lost a lot of documents in an unavoidable circumstance some time ago. You might do better posting in the "schematic request" forum here. If it existed once upon a time there's a good chance...
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    That tiny switch?!? The guy wasn't even trying to...

    That tiny switch?!? The guy wasn't even trying to get a switch that would handle the voltage. I'll wager it's bad. Maybe only under high voltage conditions and not on your meter though. I looked...
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    Yep. That's correct. And thank you. That's one...

    Yep. That's correct. And thank you.

    That's one tube. How about the other? 21W is pretty damn hot for an amp that's not class A, but I don't think it's the problem. The switch could certainly be at...
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    Ha! Thank you. I'm way to dismissive to follow up...

    Ha! Thank you. I'm way to dismissive to follow up I guess? Ok. Kudos to vintagekikki too for procuring the unobtanium as usual :thumbsup: And...

    Interesting.
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    What's the idle current in either mode Enzo...

    What's the idle current in either mode Enzo already asked this though he wanted a measurement at the fuse. You can test for idle current without an ammeter by:

    1) powering down
    2) drain the...
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    Not a member and don't speak German ;)

    Not a member and don't speak German ;)
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    From my own experience that's inaccurate...

    From my own experience that's inaccurate information. The Suhr badger uses a dual ganged gain control on consecutive stages. None of what you've posted is consistent with that. It's a well hidden...
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    +1 to Nick's post and... Glad that the 6L6...

    +1 to Nick's post and...

    Glad that the 6L6 proved the circuit and things are working. Get a proper 6V6 in there. You're lucky (or not due to all the secondary fusing !?!) that you only need to...
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    Get that old power tube outta there! You almost...

    Get that old power tube outta there! You almost certainly need a new one. It's the first suspect and always has been.

    You could put one of the power tubes from your Blues Deluxe in temporarily....
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    Too new hell,.. Sometimes you just can't get a...

    Too new hell,.. Sometimes you just can't get a bead on the thing if the manufacturer is hushy. Who's got a schematic for a Suhr Badger?!?
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    Yep! And it may even be a little different from...

    Yep! And it may even be a little different from the one I posted that was likely glued inside the cabinet of a different amp ;) With the Traynor amps there were small differences often and the only...
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    ......

    ...
    https://music-electronics-forum.com/attachment.php?attachmentid=58668&d=1590957290
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    The Blues Deluxe doesn't use a rectifier tube and...

    The Blues Deluxe doesn't use a rectifier tube and the power tubes are a different model.
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    I thought about that too, but figured that info...

    I thought about that too, but figured that info wouldn't been included if that were the case.?. Good to have it on the table for consideration.
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    In the schematic there are capacitors to ground...

    In the schematic there are capacitors to ground from the center taps of both power and signal tube filament windings. These are AC circuits to begin with and there is also no guarantee that the...
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    Ok. Yep. Did I mention that I wouldn't plug the...

    Ok. Yep. Did I mention that I wouldn't plug the power tube back in ;)
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    I almost mentioned him. Sometimes I listen to...

    I almost mentioned him. Sometimes I listen to classical music at work and every time one of his pieces airs it sounds like the pianist is having a spastic seizure.
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    So we're including CT's for the audio tube...

    So we're including CT's for the audio tube filament circuits then.?. I wondered if it should matter myself, but didn't know.
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    Well the voltages seem strangely low, but the...

    Well the voltages seem strangely low, but the ratio seems about right.?.
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    That made me laugh a little. I think they could,...

    That made me laugh a little. I think they could, it would be difficult to play though. Fun to watch ;) But then I don't think playing at both ends simultaneously happens that often. Even adult...
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    Ah! I was going to EDIT earlier with that and...

    Ah! I was going to EDIT earlier with that and forgot. Good looking out.

    But I'm not suspecting that resistor anymore because he mentioned the loud hum. I don't think that would be present if the...
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    No you didn't. I searched thoroughly. You opened...

    No you didn't. I searched thoroughly. You opened with talk of infected sites and looking for a safer way and closed with an antivirus programs link that WAS NOT recommended by anyone here, ever. Also...
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    It may be for "proper" piano lessons. In which...

    It may be for "proper" piano lessons. In which case the instructor may be getting snobby about it. But I agree in principal.
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