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    If you can't find/don't have a schematic, my best...

    If you can't find/don't have a schematic, my best advice would be to download the Duncan Tone Stack Calculator here:

    http://www.duncanamps.com/tsc/

    Plug in the values you have in your amp, and...
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    Lots of grill cloth on eBay, also (in various...

    Lots of grill cloth on eBay, also (in various sizes and types).
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    Schematic?

    Schematic?
  4. That's the same thing I do. It's just a bit...

    That's the same thing I do. It's just a bit "stouter" than your normal coffe. I also grind my own beans. My brother is also a coffee lover and he's been buying un-roasted beans and roasting them in...
  5. You're only allowed inside the amp. Stay away...

    You're only allowed inside the amp. Stay away from the outside. :p
  6. The amp can't be that good if they couldn't even...

    The amp can't be that good if they couldn't even get Jimmy to do the demo. :)
  7. If I'm going to make coffee, I'll just make a...

    If I'm going to make coffee, I'll just make a pot. I never drink just one cup anyway. Phhooey on those "one cuppers".
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    FWIW: I removed the old bridge, cleaned, and...

    FWIW: I removed the old bridge, cleaned, and reinstalled it in a couple of the first of these that came into the shop. Both returned with the same problem. Solder still good, I checked voltage at the...
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    Also, run a jumper from send to return to...

    Also, run a jumper from send to return to eliminate the possibility of a bad switching jack.
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    Are all of the filaments lit?

    Are all of the filaments lit?
  11. A picture or some specs/measurements would help.

    A picture or some specs/measurements would help.
  12. If I pay that much for an amp, I better be able...

    If I pay that much for an amp, I better be able to drive it to work.
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    That makes sense with his readings- "first is...

    That makes sense with his readings- "first is 481, second is 498".
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    ^^^^^^Agree. "white boxes" sounds like film caps...

    ^^^^^^Agree. "white boxes" sounds like film caps to me. The plate resistors in a Hot Rod Deluxe should be your standard color coded resistor. Or, maybe we are reading the two 5W resistors in the low...
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    Not to pick nits, but it's not necessary to pull...

    Not to pick nits, but it's not necessary to pull tubes to check the plate resistors. The plate is just a tube element hanging in space with the amp off. There's nothing physically connected to it. I...
  16. Gotta ask,..... What speaker are you testing it...

    Gotta ask,..... What speaker are you testing it with? I've run into this with my cheap little bench speakers. I don't use anything good on the bench for initial testing, in case something throws DC...
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    That tells you that your problem is in the preamp...

    That tells you that your problem is in the preamp section. Using that jack is a good way to verify that the power amp section works as it should.
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    Yes. The "?" is ground. Yes. You can use...

    Yes. The "?" is ground.
    Yes. You can use 1N4007. Notice polarity for negative voltage.
    Cap values should be fine, although I might use higher values to provide more filtering for the BJT stage. ...
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    ^^^^^^^ That first. No sense removing boards and...

    ^^^^^^^ That first. No sense removing boards and potentially causing more problems until you verify where the problem is.
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    Or, you could go with g1's suggestion in post #43...

    Or, you could go with g1's suggestion in post #43 and build a cap coupled negative supply off the HV winding if you want to save the cost of a new transformer.

    Edit: Attaching the relevant section...
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    ^^^^^^Yes that. I'll add a couple things. Testing...

    ^^^^^^Yes that. I'll add a couple things. Testing the bridge with a DVM out of circuit, the bridge will often test ok. It dies under load. The best way is to measure AC voltage into the bridge and DC...
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    Funny,...... The first thing I thought of when I...

    Funny,...... The first thing I thought of when I saw the title of the thread pop up was, "Oh, there's another DSL401 with a bad bridge rectifier". Besides bad tubes, it's really about the only thing...
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    ^^^^^^ That. Don't forget that the plate voltage...

    ^^^^^^ That. Don't forget that the plate voltage rating is plate to cathode- not ground. The tube doesn't know if it's cathode is grounded or not.
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    You shouldn't really even need a schematic. Just...

    You shouldn't really even need a schematic. Just look at the OT wires. It either has a 4 ohm tap, or it doesn't. If it does, just rewire the switch, or add another jack. This shouldn't be that...
  25. It would be odd for there to be no markings on...

    It would be odd for there to be no markings on the relay, but it that's so, measure the voltage at the relay coil. You should be able to figure it out from there. Just look for a relay with the right...
  26. Agree with Tom. I'll add: If it takes 20 minutes,...

    Agree with Tom. I'll add: If it takes 20 minutes, it's likely heat related. After checking for cold solder joints, I might get some freeze spray and see if you can narrow it down a failing component.
  27. From what I've seen, yes- decent used ones are...

    From what I've seen, yes- decent used ones are still over a grand. I'd think it'd be worth fixing even though it's not going to be cheap.
  28. Yep. It's just like a crossover built into any...

    Yep. It's just like a crossover built into any passive 2 way speaker. It's just built on the amp board instead of being on it's own board.
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