removing tone control in a TS

[blanik]

hi, i want to remove te tone control in a TonePad TS i figured this would do:

removing the .22 cap and 220 ohm resist and cutting the wires...



will this work or do i need to bridge parts?
i'm lookig for neutral sound... like if there was no tone control... 

i think the Tube Reamer 2 is a TS based circuit without tone control... how does it work?

R

[JHS]

It's possible but maybe you will not get a satisfying result. The 1k/220n prefilter shapes the sound too and the dynamic response could be quite different after a removal of the t-control.

Never tried such a mod.  When I decided to drop the tone control I always wired the 2nd stage like in the Gainster or Red Snapper and  I always used the inverting input on the 2nd stage and tweaked the tone with a small cap wired parallel to the FB-loop R.

I don't know your reason for dropping the control, but maybe replacing the pot with a trimpot and altering the center frequency and the sweep range of the control via tweaking those marked values will give a similar result.

JHS

[Mark Hammer]

If you simply don't install the 20k tone pot (which is kinda good news, isn't it, given how difficult it is to find one of those in some places), the op-amp which forms the tone stage simply becomes a unity-gain buffer stage.  The 220R and .22uf tantalum cap will just be sitting there stranded from the remainder of the circuit, so you won't have to do anything else.

The nice thing is that this is a completely reversible change.  If you don't like it, then simply install the tone pot.  Couldn't be easier.

[petemoore]

  Check ROG, Been a while, I think maybe the Tube Reamer has no TC.

[MikeH]

I'd figure out where I like the tone set at (all they way up?  half way?  usually about 85-90% for me), and just wire it with fixed resistors.

[blanik]

thanks guys, i played around in it yesterday, first trying to remove the pot as mentioned by RG but noticed it sounded like the tone was turned fully counterclk wich means a very dark sound, i then played with resistors between lug 2 and lug 3 (not shure of the numbers, the lug going into a 1k) i found out that conecting lug 1 to anything didn't change the sound so i left that one out...

by shorting 2 and 3 it became very bright (like fully clockwise) so i setteled for 150 ohm just to remove some harshness...

another thing, this tonepad circuit needs to be put after a buffered pedal, if i put it straight it looses a lot of highs... (i already know about the buffer issues) i'm wondering if it's easy to build an input buffer into this circuit?

R