dumbest master vol. ever?

[cedric]

i need more crunch at lower levels..
so wouldn't this work.(?)

i have an amp with four input (two channels w/ lo and hi - like marshalls etc..)
so instead of running the two channels parallel, using a cord between the two channels, couldn't i build a box with a 500k/1M pot that goes between the two channels?
setup would look like this:
ch.1, input 1 -> guitar
ch.1, input 2 -> cord to output on MASTER VOL box.
ch.2, input 1 -> cord to input on MASTER VOL box.

then simply turn the volume DOWN on ch.1, UP on ch.2
and control the output on the MASTER VOL. box/pot?

- ced

[AL]

That's an interesting thought ... and I have no idea if it will work or not.  Have you asked over at Ampage?  There seem to be more amp guys there.  

And since this is a stompbox forum my input to this dilema would be: Why not use a pedal?  And I don't mean that in a condescending kinda way.  I'm serious.  Is there something preventing you from using an existing distortion pedal or would you just prefer a master volume?  

Also, if that actually works let me know.  I've got an old bassman I'd like to try it out on.

AL

[cedric]

got an answer a ampage.
it won't work.

pedals!? for the loud rattlin' shakin' bones and speakers sound?
no i'm more into natural crunch.
where you can feel the tube breaking up.

[Hal]

well...try pushing the tubes with something like a rangemaster in the front.  THey'll break up at lower levels...you might be plesently surprised :-D

The other solution is something like a marshall power brake, but they're expensive...

[Ammscray]

I would suggest using the "stress control" master volume like Ritchie Blackmore used to have on his Marshall "pigs"...

just wire a single 1 meg pot with one outside lug going to one side of where the bias feed resistors in the PI branch off, (not where they join) and the middle lug of the pot going to the other side (each, usually 220K resistor will be connected to a PI cap at this junction)...sounds great and doesn't affect the sound of the amp when the pot is turned all the way up...I use this master all the time on Marshalls, Fenders, and Voxes...

or, you can always do the dual pot post PI master which is awesome too, just put it in one of your output jack holes on the back of the amp

[cedric]

the amp is a selmer zodiac/thunderbird.

here's what i did:
for those interested (i found the answer to mod a selmer thunderbird or zodiac for an MV elsewhere), mail me and i'll hook you up with a nice diagram.
it takes 5 minuttes to do and costs you one 500k pot and some wire.

the zodiac schem is here:
http://mysite.freeserve.com/selmer/schematic/zod3.html

- ced

the mod can also be seen here:
http://f1.pg.photos.yahoo.com/ph/neptun_krusen/

notice you only need to look at the lower left section of the schem.

[casey]

theres a guy on ebay that sells a box with a pot that you hook up
to your effects loop (if you have one).  he claims it works the
same way.... :?:

[Lonestarjohnny]

It will work 2, If you took a 1 meg pot and run cha. 1 to the left side out of your .02 coupling cap and then took your cha. 2's coupling cap which should be a .1 and hooked it 2 the right side, then the center lug would take your output of both cha's mixed back to the circuit, this would be called a Blender circuit where you could adjust as much of one cha. as you needed and in the center would be both cha's at maximum output, John Mcintyre did this in one of the fender amp's he modded for an article in one of the guitar rags, maybe it was the Prince of Wales, I'm not sure on that because it has been some time since reading it.
JD

[cedric]

It will work 2, If you took a 1 meg pot and run cha. 1 to the left side out of your .02 coupling cap and then took your cha. 2's coupling cap which should be a .1 and hooked it 2 the right side, then the center lug would take your output of both cha's mixed back to the circuit, this would be called a Blender circuit where you could adjust as much of one cha. as you needed and in the center would be both cha's at maximum output, John Mcintyre did this in one of the fender amp's he modded for an article in one of the guitar rags, maybe it was the Prince of Wales, I'm not sure on that because it has been some time since reading it.
JD

sounds fairly interesting JD.
blending a clean ch. w/ a dirty one. nice.