Channel Master Volume Issue?

[Stoneyman]

Im noticing that my channel 3 master volume control seems like it isnt as responsive as the masters on the other channels. When I turn up the other channels it is immediately noticeable, but the master of channel 3 doesnt seem to be getting louder by the same degree? Could this be a tube issue? I have been keeping each channel master around 11 oclock and controlling the amp volume with the output knob.

I turned up my channel 2 master to get a little more heat out of it, but ch 3 doesnt seem to be as lively.

Any thoughts or suggestions?

 

[knotts]

Sounds like a preamp tube. Maybe V6 as it seems like it's only one that effects only CH3 after reviewing the tube task chart in the manual. I am no expert but that's where I would start, but somebody else may have some better advice for you.

 

[screamingdaisy]

On Mark IIC+ and IV modes channel 3 starts overdriving the FX loop somewhere around 9:00 to 9:30. It's why you don't get much of a volume change past that point.

 

[Stoneyman]

Thanks. I did notice a little fuzzyness in the tone of my effects when I pushed the master. Thats why my initial thought was a tube issue. Im gonna have to work around this.

 

[knotts]

On Mark IIC+ and IV modes channel 3 starts overdriving the FX loop somewhere around 9:00 to 9:30. It's why you don't get much of a volume change past that point.

Hey Daisy. Always appreciate your advice. I'm trying to experiment a little with tubes etc., and part of that is getting a better understanding of how it all works. I was just curious if this issue could be overcome with changing out the right tube with one that has the characteristics of having a ton of headroom in the position that relates to the FX loop?

 

[screamingdaisy]

Hey Daisy. Always appreciate your advice. I'm trying to experiment a little with tubes etc., and part of that is getting a better understanding of how it all works. I was just curious if this issue could be overcome with changing out the right tube with one that has the characteristics of having a ton of headroom in the position that relates to the FX loop?

My guess (and it's only a guess) is that it'd be pointless. The whole point of the FX loop is to get unity gain with minimal colouration, and if the loop can achieve that with it's current design there's not much point of altering it. 9:00 is just a position on a knob. Where it points is unimportant so long as it produces the desired results. IMO, making changes to the circuit so that you can produce similar results with the indicator pointing at 11:00 is a waste of time. If that's your goal it'd be far easier to point the knob at 9:00, loosen the grub screw off, point the indicator at 11:00, and tighten the grub screw back up.