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The Total Amp Guts Appreciation Thread ! 1!!


The Evil Dr. X

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geezuz,

I never said it did, my point is you don't have to set a master to zero

to bias an amp. These are two separate circuits.

And before you say it, no there's no special "master volume" circuit

that requires you turning it off to bias. Understand now?

 

 

Why would you suggest that the Marshall designer informed JVM users to set the Master Volume(s) to zero when biasing the amp?

 

"Understand now?" - now you're just acting pompous. I think I'll take the word of the designer of the amp in question over yours thanks. After all, you could equally be providing misinformation.

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I've always been told to bias with master volume at 0.

 

 

Yeah well, I guess I biased around 0 but might have turned it up and played just to see if it's changing.

 

Strangely the values are changing quite drastically when I read bias on my Bogner Shiva between 0 and up on the Master, but no change whatsoever on the Marshall. Why is it changing on the Shiva, anyone know?

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Are you hearing any hum with the master turned up?

If so, that hum is a signal and it's causing your tubes

to conduct.

 

 

Hmm well possible, all my tube amps hum, at least a bit. But on the Marshall the bias meter doesn't move, even if I play the amp while reading.

 

But on the Shiva, bias might be around 30 with master on "0" and go to sth like 38 when i turn it up half, also changing when I play it. Must be a different design or what ...

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I should get around to taking more gut shots of my current amps...

Sovtek MIG 100. Completely Rebuilt by Voodoo. Hex mod and whatnot... Truely a tone monster. One of those "shouldn't have sold" amps.

mig1001.jpg
f73b6eb1.jpg
mig1003.jpg
migguts1.jpg
migguts3.jpg

Poor Rivera TBR-1M after UPS had their way with it. Look at the bent transformers...:cry:
Damage.jpg

Kinda dark, but it was in my Photobucket. Triamp MKI.
triampinside3.jpg

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