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  1. Replies
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    Bwaaahahahaha...;) Enjoying your shut in time?...

    Bwaaahahahaha...;)

    Enjoying your shut in time?

    Sorry :(
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    I did read "infinite number of odd harmonics",...

    I did read "infinite number of odd harmonics", but...

    Could you run two bucking transformer in series, but out of phase with each other WRT winding direction. I did this with the HF inductor in an...
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    This^^^^^^^^^^^^^^^^^^^^^^^^^^ I'm 52 so I...

    This^^^^^^^^^^^^^^^^^^^^^^^^^^

    I'm 52 so I remember the Fathead. It was being marketed at about the same time I was deciding I didn't like anything about my tone so I was paying attention ;) I...
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    So the "L" of the old electrolytics in the power...

    So the "L" of the old electrolytics in the power supply was suspect?

    Ok then... The capacitors have been replaced. How "new" the capacitors are I cannot say because Randall keeps them as inventory...
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    I'm just registering this detail now. That is...

    I'm just registering this detail now. That is weird. The impedance at that node should be virtually zero, so it's isolated from the signal path. That amp should have a grounded chassis, correct? So...
  6. As promised :thumbsup: I know this doesn't...

    As promised :thumbsup:

    I know this doesn't look like the AB763 reverb circuit. This will be more transparent in your amp. The mixing stage has much lower series resistance and the gain structure...
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    I've never checked a bottom board. I was just...

    I've never checked a bottom board. I was just observing that it's a possibility. I suppose you could try to wedge the two boards apart and jam some spacers in between. If the problem changes or goes...
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    I hate to put you onto this... Have you stabbed...

    I hate to put you onto this... Have you stabbed the red probe into the board here and there to see if it's conducting? And there's still the possibility that the bottom board might be doing it around...
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    I have had many conundrums on my bench just as a...

    I have had many conundrums on my bench just as a designer/builder. I actually like it in a masochistic way when things get tricky. But I don't know if I have the constitution for real working mans...
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    Ok. Any modifications. Did it get "blacfaced" or...

    Ok. Any modifications. Did it get "blacfaced" or have the small power tube grid caps been cut out, etc? The DR didn't have the same problems as other models, but they still added those grid to ground...
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    Were all the filter cap ground lead terminations...

    Were all the filter cap ground lead terminations checked and/or redone? What year Deluxe Reverb is this?
  12. Along the same line as what The Dude was saying...

    Along the same line as what The Dude was saying above, even if the 10k pot is "wasted" it still may only be the wiper assembly that's bad. This is usually the case. So the wafer may be fine. And if...
  13. I think the reason you're not getting responses...

    I think the reason you're not getting responses is two fold. There is more to consider here than what you propose and the design itself isn't the best for adding a reverb effect.

    First, you'll...
  14. Oh we do like having you around sir. Here's...

    Oh we do like having you around sir. Here's another :thumbsup:
  15. Every designer has their own ideal. As does every...

    Every designer has their own ideal. As does every player. The mix of bias methods does create a hybrid envelope. But probably more likely is that it offers a cushion for marginally matched or spec'd...
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    Sure. Why not.?. Though I don't think it matters....

    Sure. Why not.?. Though I don't think it matters. Back in the day those caps had a -20%/+80% value spec!!! Whatever modern part you're putting in will be spec with the original design regardless of...
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    The reverb doesn't generally ascribe to the same...

    The reverb doesn't generally ascribe to the same phase considerations as the main (dry) signal path because there are multiple phase angles in the reverberated signal and it's rendered quite...
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    I'm going to second Helmholtz line of reasoning...

    I'm going to second Helmholtz line of reasoning here. I was actually thinking it earlier, but wasn't quite sure enough to post.

    Notice that the vibrato channel has like phase gain stages sharing...
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    Right! I guess it could be noted that this is "as...

    Right! I guess it could be noted that this is "as it applies to this circuit" though. And the same with the power supply resistors. Those aren't just "dropping resistors", they're isolation resistors...
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    I've been there. Because I've designed one offs...

    I've been there. Because I've designed one offs for players a few times these new amps need to be thoroughly "vetted". And, of course, I've had to do the same with my repeated designs in development,...
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    Bet you wouldn't notice ;) But what does that...

    Bet you wouldn't notice ;)

    But what does that extra resistance due to either more windings or smaller wire do to the capacitance? Inductance? I think there must be audible differences. Even if...
  22. Good point!

    Good point!
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    I'm as well as anyone under the circumstances. So...

    I'm as well as anyone under the circumstances. So far I haven't read about any of the membership getting sick or testing positive. Thank you. We're here when you're ready to get back into it.
  24. +1 on the fetching price for used bench gear. But...

    +1 on the fetching price for used bench gear. But really... Used scopes, etc. are kind of stupid affordable compared to their original purchase price. How much could they go down? So instead of $150...
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    This^^^^^^^^^^^^^^^^^^^^^ I don't think I've...

    This^^^^^^^^^^^^^^^^^^^^^

    I don't think I've ever done a build that didn't obscure a couple of the OT mounting screws. In that case it's hard to have things "operational" before choosing, UNLESS,...
  26. Just going to put this out there... Any...

    Just going to put this out there...

    Any members in the area that can house some of this stuff on nevetslab's behalf so it can be reclaimed if/when he works out a better option?

    EDIT: Redundant...
  27. Can we assume you didn't have a guitar plugged...

    Can we assume you didn't have a guitar plugged into the amp and that the reverb cable is properly shielded?
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    Consider that following any voltage division in...

    Consider that following any voltage division in the tone stack whatever DC remains is on the following stages grid. Since preamp tubes typically bias under 2V it doesn't take much to throw it off.
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