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  1. Replies
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    As far "wiper open" condition, as long as the...

    As far "wiper open" condition, as long as the wiper is tied to the end of the track both circuits are safe with max neg bias.
    Dave's JTM45 schem is more 'doofus-proof' with respect to actual doofus...
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    The end result looks a bit like one of the...

    The end result looks a bit like one of the guitars I McGyver'd/PartsCasted/Destroyed when I was younger. :tape:

    I've used a rotary switch but never thought to go the extra mile to rotate it 90...
  3. The harder a symptom is to troubleshoot, the...

    The harder a symptom is to troubleshoot, the harder the solution is to name unless it's stumbled upon and recognized in the debug process. Once fixed, there may be no way to reproduce. Bad solder...
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    That's quite a temperature coefficient! Or else...

    That's quite a temperature coefficient! Or else there's a big inductive component to the element?
  5. Yikes! I think I'll be packing a DI box from now...

    Yikes! I think I'll be packing a DI box from now on.
  6. My one-and-a-half cents' worth, based on mods...

    My one-and-a-half cents' worth, based on mods I've tried:

    Do the easy first.
    Replace R27 (NFB resistor) with a resistor-and-pot circuit that can go from less resistance (more NFB and a colder,...
  7. I prefer the 'drink a beer' mod. Sometimes it...

    I prefer the 'drink a beer' mod. Sometimes it takes two or three before I'm satisfied that the amp sounds as good as it can. A funny side effect: my intonation gets better too (source: Joe's Garage,...
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    And I'll add that the effect you want is wherever...

    And I'll add that the effect you want is wherever the MV gets set for the bulk of the playing. At higher MV settings, you increase bass, and treble.. not so much. It's already bypassing the...
  9. Since the signal is capacitively de-coupled from...

    Since the signal is capacitively de-coupled from the power rails, you can simply level-shift the -12vdc and 0vdc to 0vdc and +12vdc without problems. It looks like it would work on 9vdc (typical...
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    So the fwd voltage drop from the sheet is...

    So the fwd voltage drop from the sheet is typically 0.7vdc, what we expect from one diode drop. If you are measuring across two diodes (from + to -, for example, or ~ to ~) you'd probably read...
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    What are the units? mV? What's the part/model...

    What are the units? mV?
    What's the part/model number of the bridge?
    Can you put new batteries in your meter to see if the readings change?

    - any/all of these will help determine the right...
  12. 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.
  13. 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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    479

    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
  17. 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:
  19. Great. Now I have water all over my keyboard...

    Great. Now I have water all over my keyboard :tape:
  20. 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...
  21. 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...
  23. 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.
  25. Replies
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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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