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  1. Replies
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    I had thought so, and vaguely recall seeing an...

    I had thought so, and vaguely recall seeing an example sometime.
    So in post #8, where you said 'ground some point' it would be correct to say 'ground or reference to some other potential' ?
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    In this unit the power switch is after the fuse,...

    In this unit the power switch is after the fuse, so it is a possible cause of the fuse blowing.
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    I would think the power switch may have fried. ...

    I would think the power switch may have fried. Just bypass it (for test purposes) and use the AC plug to connect/disconnect power.
  4. Took me awhile, but I guess you were referring to...

    Took me awhile, but I guess you were referring to the toilet flange job. :D


    The aluminum case ones are the ones I meant (that need to be mounted on a heatsink).
  5. I think the load resistors you are referring to...

    I think the load resistors you are referring to require substantial heatsinks to achieve their power rating.
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    Solve that C62 heat issue before you have a cap...

    Solve that C62 heat issue before you have a cap explosion. Too hot to touch is definitely not from nearby resistors.
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    I had thought he was still testing with the 10VAC...

    I had thought he was still testing with the 10VAC on the primary and so TX must be ok. :D My bad.
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    Sounds like you may have an intermittent...

    Sounds like you may have an intermittent rectifier tube. Do you have another to try?
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    Can you duet with less than 88 ? Maybe this...

    Can you duet with less than 88 ?
    Maybe this instructor is very hands on. Like the drivers ed cars with 2 sets of controls. :D
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    nosaj, the link you edited out appears in your...

    nosaj, the link you edited out appears in your quote. ;)
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    I think the 'Fr' marking on the schematic means...

    I think the 'Fr' marking on the schematic means flame retardant? So it may well be blown without any obvious visible clues. And if the power tube is bad and the screen resistor now open, it will...
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    Mains fuse is AC current.

    Mains fuse is AC current.
  13. The battery may be new, but that doesn't...

    The battery may be new, but that doesn't necessarily mean it's voltage is getting where it's supposed to. Did you check? Is there a schematic available?
  14. In this case he has cathode resistors, which is...

    In this case he has cathode resistors, which is why I asked for the voltage at the power tube cathodes. Then idle dissipation can be quickly calculated, and we can either say 'bias voltage needs to...
  15. You can use it without the keyway if you want. I...

    You can use it without the keyway if you want. I usually put a scratch in the base so it's easier to see where to line up.
    If you have the old key you can also glue it back in place.
    Or you can...
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    This means the capacitance could not be measured...

    This means the capacitance could not be measured in circuit so it needs to be rechecked out of circuit. It may be leaky, or there was a parallel circuit path that would not allow a capacitance...
  17. What is pin1 of the power tube sockets connected...

    What is pin1 of the power tube sockets connected to?
    How does the voltage shown at power tube cathodes compare?
  18. :D

    :D
  19. Replies
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    Like Enzo said, measure the current through the...

    Like Enzo said, measure the current through the fuse, both when running and during the power-up surge.

    JTM style amp with a pair of KT66 should not require any more than 3A slow-blow fuse.
  20. Agree with The Dude. It must have had the board...

    Agree with The Dude. It must have had the board pulled at least for a solder touch up or something.
    Yes the little 'bar' between heatsink and chassis can be installed wrong. But in working on...
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    Yes, I meant post #14, sorry (edited above). And...

    Yes, I meant post #14, sorry (edited above).
    And I'm mistaken, Q means 60mm, not dual. A is 45mm.
    Q1 is single, Q3 is dual.
    So if you can find a Q1, the wiper should be the same as the P1.
  22. Can you cobble together a 2 ohm 5W resistor?

    Can you cobble together a 2 ohm 5W resistor?
  23. I had thought about the same earlier. Whenever I...

    I had thought about the same earlier. Whenever I get an oddball low power amp that is delivering even less than I expect, I try different impedance loads to see if that is the issue. Sometimes they...
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    Have a look at the datasheet in post #14. As far...

    Have a look at the datasheet in post #14. As far as I know P is single and Q is dual. So I'd expect the wiper to be different.
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    You said you tried other power tubes, but have...

    You said you tried other power tubes, but have you tried another rectifier tube?
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    So from those good voltages, it looks like it was...

    So from those good voltages, it looks like it was the CF side that went bad? They (CF) do seem to be more susceptible to problems, and can be picky about which 'brand' tubes will be most reliable in...
  27. You should do the math and calculate the mV...

    You should do the math and calculate the mV reading across those resistors so you get the same idle current through the transistors.
    Not a big difference but might as well. They say approx. 3mV...
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    That's what I think too. I'm guessing maybe the...

    That's what I think too. I'm guessing maybe the rejects were liquidated and ended up on the market rather than being destroyed. In the video (post #7) you can make out the little tab he solders the...
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