Hi guys. I decided to do a mod Tim Cowles came up with for the vibro-king but I do not understand part of the directions. Any of you techs want to lend a hand? The schematics and mod can be gotten @ blue guitar schematics http://blueguitar.org/schems.htm#Fender Step # 4 is where I'm having trouble. I believe Tim is refering to R22 on the schematic. Can anyone confirm? Thanks, Paul Here's the mod..... (1) At the plate of V4A are two coupling caps in series, a .22mfd. and a .0068mfd. Remove the .22 cap and replace it with a straight wire. It is identified as C5 on the circuit board. After each of these caps is a 470kresistor to ground. Unsolder and remove both resistors from the circuit. They are R21 and R15 on the board. 2) At the cathode of V4B is a 1.5k resistor and a .47mfd. cap. Remove the.47 cap identified as C10 from the circuit. 3) Change the treble tone cap in the tone stack from 150pf to 390pf. It is C7 on the circuit board. 4) From the wiper of the treble cap to the phase inverter is a 100k resistor. Remove it and replace it with an 820 ohm 1/2 watt resistor. 5) Change the output coupling caps, C13 and C14 from .047mfd to .033mfd. 6) Change the cathode bypass cap at V4A from 22mfd to .68 or 1mfd. It is C4 on the board.