I am also a new bluesmaster owner with a fizzy gain channel.  I think I will go through and check component values also.  Can anyone tell me which resistor is the slope resistor is?  I feel a little silly asking, but I am not an electronics whiz.  Also, I am assuming that there is no way to measure actual values of the components without removing them from the board?

I suppose I should have stated my question a little bit more clearly.  I am new to the bluesmaster, but it is not a new amp.  I bought it used, it should be plenty broken in by now.

I am going to give the components a look over even if I do not change anything . . . just like to know what I have in there.  Slope resistor anyone?

i've attached a pic of the slop resistor for you, but i have a few suggestions/questions

First of all as T Wilcox suggested, you may want to experiment with the OD trim. By adjusting it you can go from slight overdrive to all out chaos, but it starts to get fizzy as you turn it up.
What kind of preamp/power tubes are you running? Different tubes can yield different results

What kind of speakers are you running? The OTS series is kinda picky when it comes to speakers.

Are you running OD and PAB at the same time? If you aren't you may want to try it. Without the PAB on (which in my opinion should be renamed Tone Stack Lift, since that is what it does) in OD mode on an HRM amp you are sending you signal through two tone stacks which can make your town sound either muddy or harsh depending on your settings.

Also, the Preamp (clean) volume will effect the overall gain as well, as V1 cascades into V2. In otherwords if you crank the clean gain and use your guitar volume to get some nice dirt when pushed, when you kick in the OD channel your OD can be very gainy and fizzy as well.

A C-Lator helps alot, but isn't technically necessary although, mine really woke up and sounded awesome with it

As far as the slope resistor goes, the common mod is to switch it to 68k or 100k and to switch the main tonestack bass pot from 500k to 250k, and i even considered doing it until the amp got nicely broken in, got some great speakers, played around with different tubes, and adjusted the OD tonestack with the PAB engaged, adjusted the OD trim, and got a c-lator.

Hope this helps, and let us know the answers to the questions if ya can; AND above all, remember all that matters is that you find YOUR tone and YOU like the way your amp sounds

Gregg

I keep playing with the OD trim and Im gettin close to where I want to keep it then the PAB on OD sounds fizzy, I have nothing in my loop right now and am waiting for a K-lator to come in mail. Dont know if it will help too much but atleast let me add the effects I like
I first tried my amp on my JSX amp speakers and it sounded awesome!
I have since built a 1x12 combo out of a old Peavey bass speaker cab ( will show pics later, but this is hopefully only temporary )
Got a WGS ET-65 and it sounded horrible all day yesterday.
It is just now starting to lose that brand new speaker harshness, ( atleast 10 hrs burnin so far )
It still doesnt sound as good as the JSX speakers which only really sounded good because they were broken in

yeah its starting to sound better already I think they call that dog ears or somethin
 heres a crappy pic of my crappy TEMPORARY cab

Don't feel bad, I;m having to play through a Vintage 30 sitting in a Line 6 SpiderValve 112.

BTW, check my other thread.