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In Reply to: RE: My results in my Marshalls posted by Michael Samra on March 30, 2014 at 15:51:13
Yeah, aspen got it right with those.
The other hard part is so much of biasing for guitar amps is done by ear within a few ma and one can always be suspect of biasing to get similar tone with different sounding tubes.
Best of all, my original pair of Gold Lions from Jim are still going strong in my Bluesbreaker since '08.
Follow Ups:
Mike, just to anal, what most guitar amps shoot for is harmonics & OD in the pre-amp and input stages. Harmonics in the output stage. OD in the output = very, very loud. Some output bottles have that magic overtones, even at moderate volume levels.
Edits: 03/30/14
In the driver stages? I was wondering because Apsen Pitman and Myles at Groove Tubes were always telling me about distortion ratings and what I need for hifi vs guitar applications.
Honest amplification is better than excessive 2nd order distortion anytime.
Mike, I've found that a clean output stage, not pushed too hard can yield pleasant results. Most vintage 6L6GC Fender amps run around 65% rated max dissipation. Large percentage of the tone is derived from setup of the gain stages and feedback parameters. I use the toughest, cleanest sounding output stage tubes that most hi-fi guys are after. Except for SET amp tubes.Even with this setup, you can really hear the difference between makes, types, and era of output tubes. Every tube has its own characteristics.
Edits: 03/30/14
Marshalls and others based on Marshall's take on the Bassman can have a lot of clipping in the Phase Inverter. It is one of the reasons I LOVE smooth plate Telefunkens in the PI, as well as bp Raytheons and RCA long plate 7025s.
Grey glass mov genalex are such bottles for sure. Swirly, 3d, rich and all other sorts of adjectives.
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