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  1. Replies
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    Please make these changes and let us know how it...

    Please make these changes and let us know how it works out :thumbsup:

    https://music-electronics-forum.com/attachment.php?attachmentid=56976&d=1581914811
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    el84's seem to behave better with larger grid...

    el84's seem to behave better with larger grid stops. Notice the value chosen by Vox! I can't speak to the technical reasons, but I think it's because of their higher gain. I chose 10k arbitrarily on...
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    As far as I know the "whacking big" 2.2M...

    As far as I know the "whacking big" 2.2M resistors (high impedance for this circuit) and the reference to a relatively high impedance -V supply via a relatively high 550k (220k grid stop series with...
  4. I'm cool with that, with one caveat. It's an...

    I'm cool with that, with one caveat. It's an impedance switch. There's a good chance under many circumstances that it could be left in one position for a very, very long time and the unused contacts...
  5. I know THAT stuff. Could work I think. My...

    I know THAT stuff. Could work I think. My consideration is that those contacts could be cleaned and then something applied that will stay put to keep them from further oxidation.

    BTW, don't get...
  6. Ok. I can buy that, but the stuff I'm speaking of...

    Ok. I can buy that, but the stuff I'm speaking of seemed to me more often exclusive to contacts, evenly distributed (never globy) and always has the same smell and color.?. Also, I know that grease...
  7. So what IS that transparent amber, tacky stuff...

    So what IS that transparent amber, tacky stuff that I find on old switches and sometimes even jacks or pots? Which, BTW, are rarely oxidized where that stuff is still present.
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    FWIW this was a popular PI for Mesa. They...

    FWIW this was a popular PI for Mesa. They actually use it in a lot of amp models designed over a span of more than a decade. So it must be working for them and their customers. In my experience it...
  9. This^^^^^^^^^^^^^^^^ A little reading on line...

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

    A little reading on line indicates that silver plated contacts aren't ideal for low voltage applications. And this would be a low voltage application. I think, clean them and...
  10. On the subject of redundant packaging, and...

    On the subject of redundant packaging, and somewhat more related to the forums genre ;) I've asked Mouser several times to omit as much of their secondary packaging as practical. They never have....
  11. Well, getting back to the tone of the thing for a...

    Well, getting back to the tone of the thing for a moment. I think the extra saturation might be a consequence of our era. Jimmy's played through a lot of amps since then and most of them were...
  12. Not too long ago I was researching the venerable...

    Not too long ago I was researching the venerable Soldano SLO-100 and many discussions on other forums included participants that felt entirely confident to comment on the amp based on their digital...
  13. Second that. But give me 25k and I'll get on...

    Second that. But give me 25k and I'll get on board to help someone do it! Right?

    In fact,.. I bet I could get Jimmy Page himself to go to one of these guys houses and piss on the amp they have now...
  14. Yepper g1. On my last reverb amp I found that...

    Yepper g1. On my last reverb amp I found that changing one of the speaker types in a 2x12 combo squelched the resonant actuator for the feedback. I did go back to the original configuration with two...
  15. If they sell three it was worth the effort to...

    If they sell three it was worth the effort to involve Jimmy and put all the hype in place. I think the amp sounds "pretty much" like the LZ1 recordings, but not quite. There's something a little more...
  16. It would help to know more about the problem....

    It would help to know more about the problem. Does it start with feedback in the LF (then bringing in all the springs frequencies) or is it higher pitched to start with? And, as already asked, does...
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    FWIW I've read a couple of threads elsewhere that...

    FWIW I've read a couple of threads elsewhere that indicate a Krank amp (a few different models) as prone to oscillation. One thread here and SGM (don't ask if you don't know) said "design flaw" and...
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    The schematic shows that opposing phase stages...

    The schematic shows that opposing phase stages are sharing the HV supply nodes. This arrangement tends to not oscillate with power supply decoupling cap failure. But do try paralleling another...
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    Rather than resurrecting an old thread, it's...

    Rather than resurrecting an old thread, it's usually best to start a new thread with your amp model, a schematic if available and a description of the problem you are having.
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    Well it looks like the OP dropped this question...

    Well it looks like the OP dropped this question here, another tacked onto the necrothread about this amp and hasn't been back since. No activity on his account since he clicked "post". The good news...
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    I use to have that problem with el84's in two...

    I use to have that problem with el84's in two amps that were at or over 400Vp and used a choke to the screens (so they were only a couple of volts lower). But not how you're thinking. These were both...
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    I like Helmholtz's idea of adding a rectifier...

    I like Helmholtz's idea of adding a rectifier tube. Though that may not be the easiest solution. Otherwise I don't think there's a problem with what you've done. But then...

    I don't think there's...
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    A recent post added to the necro thread on this...

    A recent post added to the necro thread on this topic solicited by the OP here.

    Looks like there's three secondary taps to me.


    ...
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    Thank you Strato56. I'm adding this post to the...

    Thank you Strato56. I'm adding this post to the current thread on this topic where it will be even more useful.
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    As does a loss of bias. And in an old amp this is...

    As does a loss of bias. And in an old amp this is what I would suspect first. An intermittent grid connection would be both a high (or infinite) grid resistance AND a loss of bias. This could be a...
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    I lived a long while in San Jose (in the S.F. bay...

    I lived a long while in San Jose (in the S.F. bay area) so I know Livermore, Oakland and San Fran very well. It's good you got out a bit while there. So much of the human occupation there is a...
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    Never made it to the east coast. I don't travel...

    Never made it to the east coast. I don't travel much so it's more of a bucket list thing. I did get as far as the Carolinas a few years ago and that was an eye opener. There's a weird energy in the...
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    This^^^^^^^^^^^^^^^^^^^^^^ There are...

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

    There are mechanical structures and connections in the tube that may or may not be open or incorrectly connected in the event of a catastrophic failure. There's always a...
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