That certain point...

[PRNDL]

Here's a relevant video
http://guitarjamdaily.com/index.php?...ontent&id=2011

In Part 2 of our Behind The Scenes Interview with Greg Germino, Ken and Greg discuss the difference between a master volume amp and a non master volume amp. They also talk about practical ways to reduce volume without losing too much tone. Greg than reveals his thoughts about his favorite contemporary players. At the end of the session, they get into some great detail about Celestion Heritage series speakers and Scumback speakers.

[6267]

Have you tried a piezo tweeter or a different speaker? Those headphones are very efficient and don't have much in terms of cone to push around. If the output's just swamping out on the big speaker, then a smaller or more efficient speaker might cure it.

It could also not be driving the power tubes much out of the edge of their linear range, you know, where the lines are all mushy. If it's adjustable bias, you might want to just swap in some lower power tubes...I've seen 6K6 take fairly brutal anode voltages. 6F6, 6Y6, 6U6, you'd have to check out the data sheets, most of them will put out about half or less of the power of a pair of 6V6. They'd be more linear at a lower volume, though. Maybe an amp where there are four power tubes, 2x6v6 and 2x6F6, and it can have either or both being used...probably want to have a 2 speaker or more combo and have each pair with a seperate OPT. Probably a good tone, at least, and versatile.