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    https://www.youtube.com/watch?v=ztrQI0ZoVVU

    https://www.youtube.com/watch?v=ztrQI0ZoVVU
  2. I see that GC is a distributor, if that invites...

    I see that GC is a distributor, if that invites confidence in their supply chain... I've never heard of them before now.
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    At least JJ puts out next to no data on their...

    At least JJ puts out next to no data on their tubes to avoid (presumably in good faith) putting out unverified or unreliable data :p
  4. The one thing that strikes me as odd is the 6.8M...

    The one thing that strikes me as odd is the 6.8M grid leak (?!) bias of the concertina stage. Maybe done to save 1 resistor? I can't imagine it's better than either of the two example schems shown on...
  5. You can try :)

    You can try :)
  6. There are a lot of basic musical...

    There are a lot of basic musical instrument-oriented tube circuits, many of which are identical to design standards and popularized by Fender. Compare schematics found here and see how similar they...
  7. Let's talk about the 'tube sound' for a moment....

    Let's talk about the 'tube sound' for a moment. Tubes - as in this circuit, single-ended triodes - color the sound by ever so slightly distorting the pure wave form of the signal in an asymmetrical...
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    What signal did you use when measuring screen...

    What signal did you use when measuring screen current? 1ma or thereabout does not seem unreasonable at idle.
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    Short, non-technical answer: the size of the...

    Short, non-technical answer: the size of the transformer is inversely related to the frequency at which it operates. Computer PSUs (almost exclusively SMPS) operate at tens or hundreds of kHz. Why...
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    The switch will work just fine. The poles of each...

    The switch will work just fine. The poles of each switch go not to input, but to one end of each winding, so that
    L1 -> start of one winding, end of that winding -> pole
    (other) pole -> start of...
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    No. Put in the right switch, no more difficult...

    No. Put in the right switch, no more difficult than wiring up a speaker cab for 4 or 16 Ohm operation.
    Cheaper and easier than replacing the PT, regardless of how far away and inaccessible the amp...
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    If the early clipping follows the tube, then the...

    If the early clipping follows the tube, then the tube is at fault. I do not expect this behavior to be considered normal.
    What audio power do you get when adjusted right at the point it begins to...
  13. With the two 470k resistors feeding signal and...

    With the two 470k resistors feeding signal and sidechain to the output, it appears to me that the effect is "mixing" a modulated ground Z with the signal. :noob:

    edit: so that makes the second...
  14. filter (verb)...

    filter (verb)

    filter (signal processing)
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    What's the voltage drop across the resistor?...

    What's the voltage drop across the resistor? Since the resistor and the diode are in series, they must pass the same current. Calculate the current through the diode using the 1.5k resistor voltage...
  16. iep hasn't posted in almost 4 years. Doesn't mean...

    iep hasn't posted in almost 4 years. Doesn't mean they won't drop in from time to time! You might want to start a new thread requesting such mods, get a few fresh ideas tossed at you. Good luck, and...
  17. Yeah, it's the old lecher in me, I guess...

    Yeah, it's the old lecher in me, I guess...
  18. Oh, now that's real nice guitar porn ;)

    Oh, now that's real nice guitar porn ;)
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    Sticky: What? Nobody uses https://www.angela.com/ ?

    What? Nobody uses
    https://www.angela.com/
    ?
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    You rocket scientists all think alike :p

    You rocket scientists all think alike :p
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    Right! I guess my question was an awkward way of...

    Right! I guess my question was an awkward way of asking how to NOT worry about that thermal fuse. I know the line fuse is to protect the venue, not the equipment; like a lot of us, I'd like to think...
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    Is there a way to guesstimate, based on the VA...

    Is there a way to guesstimate, based on the VA rating of the PT, what may be safe to prevent the PT's thermal fuse from blowing? I'm thinking something like
    fuse rating = VA/nominal line voltage *...
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    Whoa. Sorry to hear that. Care to elaborate?

    Whoa. Sorry to hear that. Care to elaborate?
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    +1. Removing the death cap provides a hole in...

    +1. Removing the death cap provides a hole in just the right spot to jump the screens. And the switch can be re-purposed, so no parts to buy!
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    I think mentioning CERN instead of cheese would...

    I think mentioning CERN instead of cheese would have been more in line with offering 'tech cred' about the guitar :p

    edit: yes, interesting video. Fun!
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    Right! I agree with your assessment. I'm only...

    Right! I agree with your assessment. I'm only trying to pick nits here.

    The sound has a smoldering intensity, very controlled and 'proper British'. I think it has to do with the execution of the...
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    I can see a confusion arising by mixing up...

    I can see a confusion arising by mixing up 'clean' tone and 'pristine' tone. (As Frus mentioned Pink Floyd) David Gilmour has a habit of really overdriving his guitar but not letting it get fizzy....
  28. The shared cathode resistor helps reduce cathode...

    The shared cathode resistor helps reduce cathode degeneration from the lack of a cathode bypass cap. If you split the resistors, it'll have an impact on the gain of the power tubes if you don't then...
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