I've been fixing up a AA270 Twin Reverb, and getting it to AB763 specs. One difference is that there is a 0.002uf capacitor from the grid of the reverb recovery triode (V4B) to ground on the AA270, bypassing the 220k resistor. There is no such cap on the AB763 specs. See http://ampwares.com/schematics/twin_reverb_aa270.pdf vs https://cdn.shopify.com/s/files/1/2...everb-AB763-schematic.pdf?5926397210715640943 I've clipped this resistor in and out of the circuit, and I think it makes an audible difference to the tone (but barely). But definitely having it in the circuit reduces a lot of the buzz coming from the reverb tank. It's not intolerable without the cap, but definitely a little bit buzzier. Does anyone have suggestions for other ways to reduce the buzz that won't affect the reverb tonality? Are there any particular wires that better lead dress would help reduce the buzz? Or am I just hearing a difference where there is none, and I should put the .002uf cap back in?