Mystery Knob on Back of Ed's Amp Was FET ?!?!?

  • Thread starter Thread starter Ben Waylin
  • Start date Start date
Racerxrated said:
I use one with my 72, and @90v it'll still rip your face off to get that kind of gain. WAY too loud for the Letterman show, which is more like a small club 'quiet' volume.
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I should mention that the only reason I use a variac is to try and preserve the PT....these were designed for 110 back in the 70s; nowadays we all know our outlets are 120+ mostly. Many Marshalls from the 70s have replaced PTs from running them hotter.
 
Racerxrated said:
I should mention that the only reason I use a variac is to try and preserve the PT....these were designed for 110 back in the 70s; nowadays we all know our outlets are 120+ mostly. Many Marshalls from the 70s have replaced PTs from running them hotter.
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I have to run my 73’ at 110-115v. The plate voltage is 510vdc or something at 120v
 
My '69 clone is still loud af when variac'd to 90vac. Still rattles everything in the room. When I run it variac'd to 90vac...the load box gets pretty damn hot but the amp itself is not that hot. Not even close to old-Fender-combo-hot.

TBH, the hole/pot in the back I never worried about. Didn't look like he was using it whatever it was, I figured you wouldn't leave a pot on the back knobless if you used it so it was a non-issue. Harder to adjust and harder to see if it's been adjusted so unless he always ran it pegged at an extreme it wouldn't make sense for it to be knobless.
 
LPMojoGL said:
I'm so glad there's this thread. We're finally gonna get to the bottom of it.
Oh, and klon, dumble, and apparently soon to join said status, Naylor.
Party on.
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It's the old guys in the break room during break. "Hey Frank tell us that story about..." and Frank repeats that same funny af story for 129th time...and we all laugh for the 129th time. And so it goes with the story of the glory hole in Eddie's 12 series.
 
PLX said:
timestamped where Dave got the amp to restore to stock:


timestamped where Dave talks about the mystery knob on back of amp:
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Cool vids. Lots of cool stuff.

One thing that often bugs me about these type of interviews though is that the Interviewer often talks over the top or cuts off of the interviewee.
It often seems like they are just about to continue on with some cool info and the interviewer sees the gaps as an opportunity to jump in and give their opinion or move onto the next question... Dude, learn the technique and stfu to let your subject fully make their point. Thats why you are interviewing them in the first place. Unless they are equivalent peers, then it's more of a conversation, not an interview.
Another thing is when they start correcting the person, again stfu and let it happen, unless it's grossly wrong or mistaken info of course. I felt like that happened in the interview with Bob Rock that Pete Thorn, Dave F and some other dude put up a while ago.
 
RaceU4her said:
the variac at 89v or whatever supposedly brings 100w into the 20something watts??


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Someone with better eyes than me, please check this. Is that Marshall on stage at Letterman's on? I don't see the indicator light on front lit up.
 
guitup too said:
Someone with better eyes than me, please check this. Is that Marshall on stage at Letterman's on? I don't see the indicator light on front lit up.
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When you dial the variac down past a certain voltage, the pilot light either flickers, or just goes off.
 
I kinda dig the fact that we’ll never know for sure. I think the thing I dig about it the most is that it kinda dips between being a believable variac’d Marshall and “No way, there’s somethin’ else going on there”, just enough to keep ya guessing. Then the hole gives ya that extra bit of confirmation bias/intrigue.

Wolf recorded this solo to this tune using Frankie into it, it still sounds great and it’s pretty cool we can still hear it. Solo’s got both Vai and EVH phrasing going on, dude likes nuance on those notes.
(start it at 4:00)
 
Racerxrated said:
I should mention that the only reason I use a variac is to try and preserve the PT....these were designed for 110 back in the 70s; nowadays we all know our outlets are 120+ mostly. Many Marshalls from the 70s have replaced PTs from running them hotter.
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Just cooked my ‘69’s PT again…..the smoke was a rollin!
 
PLX said:
Watch the video in the OP..

He completely destroys that theory.

You'll get it, if you listen to what he's saying, because the location for that mod is all wrong.
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I wouldn't consider location that great of evidence. Certainly not destroying the theory.

You have to factor in Ed liked to keep shit secret.
 
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