black stripe ultra in the hands of frankenstein

marinebassplayer said:

i have one more switch in my possession, what can i do with it???


the list of mods i have tried:
a 3 way switch on c-3
the r7 resistor bypass "boost" mod
the mid sweep
r1,2,3 changed to 150 ohms
r10 between stock 10k? and 470kohms (removed)

Click to expand...

SacredGroove said:

marinebassplayer said:

i have one more switch in my possession, what can i do with it???


the list of mods i have tried:
a 3 way switch on c-3
the r7 resistor bypass "boost" mod
the mid sweep
r1,2,3 changed to 150 ohms
r10 between stock 10k? and 470kohms (removed)

Click to expand...

R10 won't do a whole lot for you. You may notice a loss of some high end with a higher value resistor there, but on the Ultra R10 is probably the last place I'd think of trying to improve/alter tone, unless you have cap across the resistor.

R7 is a Grid Leak resistor. It's often referred to as having a "boost" quality because it's ability to be removed. When R7 is removed, there is a disconnect from ground, therefore, all signal present before R7 will be retained and allowed to pass, but only on certain pcb's, including the Ultra.

Click to expand...

marinebassplayer said:

now back to the cap on r10 idea. what value range would you put there???

Click to expand...

SacredGroove said:

Like I mentioned before, it's not the place I would go to mod. But, if you want to try something there you could use your 470k resistor or a 1M resistor with the combos below. The higher the resistor, the more attenuation on the freq's below the cut-off freq.

500pF//470k=677Hz
470pF//470k=720Hz
250pF//470k=1.3kHz

250pF//1M=636Hz
220pF//1M=723Hz

Click to expand...