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    This^^^^^^^^^^^^^^^^^^^^^^^^ Or... Other tone...

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

    Or... Other tone shaping circuitry. That isn't supposed to imply that there's a way to make a preamp sound like a "whole" amp. But there's no reason a preamp can't...
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    Jeez this is getting dark. But it's a VERY...

    Jeez this is getting dark. But it's a VERY serious subject to be sure. I can personally attest to that because I'VE been hit. My band was playing a dive bar where (apparently) the owner fancied...
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    This^^^^^^^^^^ Consider the variables running...

    This^^^^^^^^^^

    Consider the variables running gear on stage in different polarities and possible ground faults, or lifts, or some of the gear is old and has a hot chassis AND is plugged into that...
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    Getting the voltage on the tubes correct isn't...

    Getting the voltage on the tubes correct isn't critical, but closer is better. If you're too far off, like 20%, you could start to hear a difference.

    That said... There will be other matters that...
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    I call that the 'Love me or hate me, but I won't...

    I call that the 'Love me or hate me, but I won't be ignored.' syndrome. And there's a lot of 'em out there. Some open with a big smile and others open with confrontation. Either will flip tactics...
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    There's a VERY common trend in the sound...

    There's a VERY common trend in the sound reinforcement, home audio and car stereo industries to state "peak" power rather than RMS. Peak power is the highest possible wattage demonstrated at whatever...
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    Did he know he said that crap out loud? That's a...

    Did he know he said that crap out loud? That's a guy with too much time on his hands and trust issues. What a social retard! The kind of guy that always has trouble because of how he negotiates...
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    Hey Randall, I think I know that guy. Ok, not...

    Hey Randall, I think I know that guy. Ok, not "him" but a guy just like him. I'm reminded that a very wise, older painting contractor once told me that the success of my business will depend greatly...
  9. ......

    ...
    https://music-electronics-forum.com/attachment.php?attachmentid=54288&d=1562930390
  10. And now we know your true heart. I'll see you...

    And now we know your true heart. I'll see you when the zombie apocalypse starts ;)
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    But, but... We did have a discussion on the...

    But, but...

    We did have a discussion on the asymmetrical totem arrangement here before. g1 links the circuit in question in post #21, Malcolm makes a good point on the matter in post #30 and Ian...
  12. Well his last activity was a couple of months...

    Well his last activity was a couple of months ago, but his most recent posts show he hasn't visibly participated since March? Let's hope he's just busy right now. Being as he's in Las Vegas he's...
  13. I would think a high fret would be a "popped"...

    I would think a high fret would be a "popped" fret. As I can't imagine any other way for a single fret to be high after any leveling. That should require different attention.

    I suppose a high...
  14. I fully believe it works, and well. It's a...

    I fully believe it works, and well. It's a terrific design, BUT... Since these are probably made overseas I would watch out for anomalous alignments of the active planes once they start to move and...
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    And I'll add, a conductive socket. This sometimes...

    And I'll add, a conductive socket. This sometimes happens with a catastrophic tube failure. Do we know if this may be part of the amps history? It hardly matters. Unfortunately testing the socket for...
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    Ah! Yes. I hadn't noticed the different cap...

    Ah! Yes. I hadn't noticed the different cap values on the later node at a glance. Kinda stupid design IMHO. Why not just make all three caps 100uf and call it macaroni!?! Fender has a couple of...
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    But because there's no shorting balance point...

    But because there's no shorting balance point there is NO voltage and then high voltage during the action of switching. Not to mention that the screen itself is disconnected from HV during the...
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    I understand this. But it's just not how it's...

    I understand this. But it's just not how it's been done most of the time and (therefor) it's probably not something you can automatically expect. There ARE switches that will handle the job. I've...
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    I've used plain ol Alpha rotary switches and just...

    I've used plain ol Alpha rotary switches and just doubled up the poles. By "electrical" standards it's not that demanding current wise. It's the voltage rating you need to pay attention to. I don't...
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    No pun intended? I've even seen this even with...

    No pun intended?

    I've even seen this even with axial caps. The ground is the case and there's only the thin, brittle and sheer shrink wrap around it. Most of the time this is not a problem because...
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    To expand on this... You absolutely can expect...

    To expand on this...

    You absolutely can expect asymmetry in most tube amps when clipping, but typically only when clipping hard. Hard as in pretty much a square wave. I mention it just so tubes...
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    That is how it's usually done. That is, keeping...

    That is how it's usually done. That is, keeping the existing screen grid resistors in the circuit.
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    And to add... No you don't have to replace the...

    And to add... No you don't have to replace the transformer if it has not failed. Just wire it correctly.
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    250/2=125uf 220/2=110uf I think it'll be...

    250/2=125uf
    220/2=110uf

    I think it'll be alright ;)
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    It's possible that the coupling capacitor feeding...

    It's possible that the coupling capacitor feeding the left position is leaking DC voltage onto that power tubes grid. Another possibility is a bad connection for the grid to ground resistor on the...
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    Schematic? And... With "totem pole" capacitor...

    Schematic?

    And... With "totem pole" capacitor arrangements the caps do share voltage (provided there are "balancing resistors"). This should be sufficient information for capacitor selection. A...
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    You're absolutely right. I didn't look at the...

    You're absolutely right. I didn't look at the schematic and took g1's post at face value. Looking at the schematic I see that the bias supply for the dr504 has room for adjustment in the voltage...
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    The KT66 is described as a "beam pentode" with a...

    The KT66 is described as a "beam pentode" with a max Vp of 500 and a max diss of 25W.

    The kt77 is described as a "beam tetrode" with a max Vp of 800 and a max diss of 28W.

    You have 503Vp at...
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