Tube buffered phase inverter

  • Thread starter Thread starter paulyc
  • Start date Start date
I'm thinking it could be a triode stage configured as a cathode follower inserted between the tone stack and p.i. input, to drive the p.i. with a low impedance signal.....or maybe not.....:scared:

Also, I believe the EVH Iconic has a solid state phase inverter.
 
Blackstar HT series amps use a MOSFET long-tailed pair.

Vox Valvetronix amps had a MOSFET phase inverter.
 
PLX said:
Blackstar HT series amps use a MOSFET long-tailed pair.

Vox Valvetronix amps had a MOSFET phase inverter.
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I'm thinking my Peavy Vypyr Tube 60 does as well. Possibly my Blackstar Killer Ant. Need to double check.
 
Most of the amps that you guys are talking about with SS phase inverters seem to be much newer designs, this Marshall is 1981.
 
paulyc said:
Most of the amps that you guys are talking about with SS phase inverters seem to be much newer designs, this Marshall is 1981.
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With all due respect I don't see how that matters anymore. You kind of got your answer right?
 
paulyc said:
Not really, I got an opinion. Hardly an answer. Still waiting in Henrik for the “official” answer.
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Wow. Really? Lots of Rigtalkers came in here to reply and provide some decent explanations. It is obviously NOT that common, hence the opinions. And not even ONE thank you.

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311splawndude said:
Wow. Really? Lots of Rigtalkers came in here to reply and provide some decent explanations. It is obviously NOT that common, hence the opinions. And not even ONE thank you.

QGVy9Cy.gif
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When/if Henrik gives me his answer I will update the thread with that info, THEN I was going to thank EVERYONE that participated, didn’t expect Henrik to take this long but it is what it is. Sorry if you’re miffed.
 
paulyc said:
When/if Henrik gives me his answer I will update the thread with that info, THEN I was going to thank EVERYONE that participated, didn’t expect Henrik to take this long but it is what it is. Sorry if you’re miffed.
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IF Henrik gives his answer, THEN you are going to thank everyone. Nice :D

Anyway, he doesn't seem to be eager to answer technical questions/details.
 
Look, I was communicating with him, it’s the last question I asked him, just to clarify what he means. Wasn’t looking for a schematic from him or anything. Didn’t expect things to go dark, I fully expected to have had the answer days ago. THANK YOU to EVERYONE that contributed to the thread. I hope I get the straight dope, if I do, I’ll update.
 
paulyc said:
Look, I was communicating with him, it’s the last question I asked him, just to clarify what he means. Wasn’t looking for a schematic from him or anything. Didn’t expect things to go dark, I fully expected to have had the answer days ago. THANK YOU to EVERYONE that contributed to the thread. I hope I get the straight dope, if I do, I’ll update.
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Until we know for sure, let’s just assume my assumption was correct
 
paulyc said:
Henrik’s answer seems to line up with you and CrazyNutz’ theory, but you were first. Congrats, here’s a cookie.
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I have a 1992 VHT/Fryette Pitbull that has this kind of buffered PI.

At some point a standard unbuffered PI cannot drive the load of larger power tubes, or higher power tube count (think 6 instead of 4)
This is where the buffers come into play, they do basically what a CF does to drive the tone stack.
 
mcstinger said:
I.e. Peavey 6505 MH uses transistors in PI.
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I believe the 5150 iconic uses LND150s for the phase inverter. It’s why there’s a current shortage of them - they’re used in analog transistor buffered effects loops (evolve, metro, etc) among other things.

Personally I don’t like LND150s. I don’t like what they do to the top end of the signal. They work but I prefer to do things a different way…
 
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