I think mine's at about 11 o clock. Having it on a pot or something you could tweak without having to pull the chassis would NOT be undesirable...to me anyways. Somebody here did that but that looked a little to involved for me.

Hi Steven,

It' s the upstanding trimpot located next to the 4,7 uF electrolytic cap. A 220 k resistor is leading towards it.

Hi Steven, it' s inside the amp! (that' s why it's called internal )

Pls Steven, Check the Layout as Zucker posted it. You' ll find it.

I have it about 12 o clock.
Very nice and ballsy tone with my strat and unreal pleasure with my new Les Paul.
 

Steven: Especcially for you;

That trimmer pot has a *huge* effect on the amp's tone and response.  A quarter turn can be the difference between a very good and fairly bad sounding amp. I suspect some of the people that did not like the tone of the amp when they got it may not have fully explored the power of this trimmer. Ideally it should be re-adjusted whenever other changes are made to the amp.

On my amp the sweet spot is between 9 and 10 o'clock, more like 9:15-9:30. I'd like to see either an access hole on the bottom of the chassis for trimming (of course that would be a significant layout change), or a fine tuning pot on the bottom, like a Fender bias pot, with the "coarse" adjustment set internally and the "fine" set externally. An external pot with the full range of the internal trimmer would be too sensitive IMHO.