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  1. Replies
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    I mis-read the schem. I see now that cathodes and...

    I mis-read the schem. I see now that cathodes and plates are tied 69-style.
  2. What tubeswell said. Also, as extra insurance,...

    What tubeswell said. Also, as extra insurance, you can do what a machinist taught me: Start with a bit no bigger than the mark you made. Step up a size or two, redrill. Take several iterations to get...
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    First, how does that function? Is it modulating a...

    First, how does that function? Is it modulating a load impedance on the first stage's anode? That's weird.
    Second, since I don't know how it works, I shouldn't be offering any advice... but unless...
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    Oh! You meant volume! I was referring to sneaking...

    Oh! You meant volume! I was referring to sneaking off stage between horn stabs to get a beer or pinch the girls :twisted:
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    I played trombone in a band for a few years....

    I played trombone in a band for a few years. You're right, we were wild! :p
  6. If it's there because the legal team sought to...

    If it's there because the legal team sought to prevent pencils/chopsticks/wire coat hangers from getting to the circuit board, it's mistaken protection. This only increases Fender's liability since...
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    I've never seen one,but the fact that it sits on...

    I've never seen one,but the fact that it sits on the front panel of the amp gives it some appeal :thumbsup:
  8. Great. Now I have water all over my keyboard...

    Great. Now I have water all over my keyboard :tape:
  9. I'm just talking out my blowhole, but I might...

    I'm just talking out my blowhole, but I might expect a super-high-fidelity amp using an SE configuration to only produce a fraction of the rated output power of the tubes, in order to stay in the...
  10. So just to bump this question (and dispense with...

    So just to bump this question (and dispense with the social formalities):

    Anyone with experience on these TF1 modules (found in a TX816 rack)? Is there a procedure for adjusting the analog output...
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    I ordered a few values of the PR01 (02?) series...

    I ordered a few values of the PR01 (02?) series 1W resistors. I have to keep them away from my bulk resistor assortment, because I'll confuse them for 1/4W! I feel dizzy whenever I thumb through them...
  12. Maintaining Yamaha TX-816 tone modules (TF1)

    First, let me say that Yamaha naming a new series of mixers with the same model name (TF1) as an older product warrants a big thumbs down from me. Makes Google searches for info on the older device...
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    I like :thumbsup: And in the example, the...

    I like :thumbsup:
    And in the example, the cathode is bypassed.
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    True. But even that depends on a signal that is...

    True. But even that depends on a signal that is not balanced; if the cathode currents are opposite and equal then there's no cathode voltage deviation to drive a signal. If the grid error signal is...
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    All right, I was thinking that like a...

    All right, I was thinking that like a conventional paraphase, there's a voltage division. But I see this is a little different.
    I see that a voltage will develop at the node of R4 and R5 only when...
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    I don't expect that R4 and R5 have the same...

    I don't expect that R4 and R5 have the same value. Do they?
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    You need to measure it out of circuit ;)

    You need to measure it out of circuit ;)
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    Here's my non-technical take: If the amp's PSU...

    Here's my non-technical take: If the amp's PSU was really stiff, there'd be no problem. Each odd stage - in this case, the input stage, the stage after the mid control, and the FX loop send - are all...
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    My first build had quite a case of...

    My first build had quite a case of 'motor-boating', which is what you're describing.

    You could try moving the FX loop stages to the "C" node, but even then another RC filter for the input - per...
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    On my guitars, I sometimes find that the jack has...

    On my guitars, I sometimes find that the jack has rotated, usually as a result of me trying to tighten it without proper tools when I notice it is loose. Sometimes the rotation can cause strain on...
  21. Is the placement of the second grid signal as the...

    Is the placement of the second grid signal as the junction of the two grid leaks significant? I'm trying - and failing - to envision what the voltage of that node is actually doing. Is it staying at...
  22. I find myself making a list of changes, putting...

    I find myself making a list of changes, putting them in, and then trying to figure out which one *didn't* do what I expected :(



    The anode resistor makes a wee difference in the dynamic...
  23. As you go higher with the anode resistor, the...

    As you go higher with the anode resistor, the load line flattens out a bit, giving the stage more output swing for a given input swing. Not a lot, not like a 470k will magically create 470k/100k =...
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    I didn't start it, so I feel reluctant to spoil...

    I didn't start it, so I feel reluctant to spoil the fun. So, yes.

    and Juan, it's all fun. We're not picking on anybody.

    edit: simulpost!
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    Nigel just needs a helping hand ;)

    Nigel just needs a helping hand ;)
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    Or maybe Google Translate is just really...

    Or maybe Google Translate is just really depressed today...
  27. What's B+? I'd suspect trouble with the socket...

    What's B+? I'd suspect trouble with the socket where pin 3 reads high. 515vdc suggests the tube is not conducting? So either the plate pin or the cathode pin not making good contact with the tube.
    ...
  28. Does the hum change with a different set of tubes?

    Does the hum change with a different set of tubes?
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