On this '69 Bandmaster Reverb (as well as my Super Reverb), theres a 120pF capacitor bridging the vol & the switch. Doing a little investigation on this, I ran across a video in which the guy recommends swapping out the stock value for a 47pF, which he says eliminates the shrillness. The 47pF is found stock on the Deluxe Reverb. Anyone ever heard of doing this?