Please post the original schematic or we don´t know what C** , R** ,etc. mean.
That said, read this thread:
which tells you more than you wanted to know about the Vox tone stack, and why you should not mess with it.
In any case, those so called "Caldwell mods" do very little, close to nothing; definitely nothing to brag about.
Guess you mean the Treble cap: both values are valid and have been used in different versions; point being that to begin with with 20% tolerance used way back then, both can very well measure the same.Tone stack tweak
C16 = C23 (stock 56pf) -> 47pf
And more important, being such a small value and considering the high value pots used (1M vs. typical 250k found in Fender), parasitic wiring capacitance can easily add 10 to 20pF (or more) so shifting effective value big time.
Maybe you mean some "Bright" cap?Top Boost treble cap:
C13 = C15 (stock 120pf) tweak to taste (68pf?) or remove
Messing with it will kill some of typical VOX chime/sparkle ... you sure you want that?
You may get extra 20% gain ... about 0.1 or 0.2dB not noticeable to Human ear.Plate resistor mod:
R6 & R7 = R14 & R12 respectively. However, R14 is already 220k so all you have to do is change R12 from 100k to 220K
Of course, after you Mod something, "it always sounds better"
And if mods mean Brand change ... think again.
Maybe there is a reason Schematics show parts Value and not Brand.