I'm trying to do some 1959 to 2203 preamp conversions. I couldn't really find any step by step instructions on the net. So I took a look at these three images and wrote the steps I though needed to happen. I must be missing something as I haven't been successful yet. I know I haven't done the instructions on how to wire the input jacks yet, I'm not exactly sure how to write that out. Anyone want to look them over and see if I've done anything wrong or missed something? ##### 1959/87 Preamp to 2204/3 conversion ##### *Normal Volume pot becomes the Preamp Gain pot *Bright Volume pot becomes the Master Volume pot Remove V1A Cathode Capacitor and resistor. (Usually a 330uf or 220uf cap and a 820 resistor) Replace the now removed V1A Cathode resistor with 10K resistor. Wire from the V1B Plate Bypass Cap (.022 cap) which is currently connected to the far left lug on “Bright Volume” pot, gets moved to one of the input jacks Disconnect wires from all 4 68K input resistors and heat shrink them to cap off. Replace green wire on V1pin2 with shielded wire going to the middle leg of “Normal Volume” pot. Connect the shield from that cable to the far right lug on the “Bright Volume” pot Disconnect V1 pin 7 wire. Replace it with a shielded cable. On the end connecting to V1 pin 7 connect a 68K resistor. Run the other end of the shielded cable to the input jacks. Move wire from Normal channel mix resistor (470k on the left) to the bus wire. Disconnect and cap off the wire from V1A Plate Bypass capacitor which is currently connected to far left lug of the “Normal Volume” pot. Then move wire from Bright channel mix resistor (470k on the right, currently connected to the middle lug of the “Bright Volume” pot). Connect it to the V1A Plate Bypass capacitor (Usually the most left .022 cap). If installed, disconnect the .68U V2A cathode cap. Leaving the 820 resistor. Move wire from the far right .022UF tone stack capacitor next to the 33u+33U cap FROM middle leg on the treble pot TO middle leg of “Bright Volume” pot. Install a wire from middle leg of treble pot to far left of “Bright Volume” pot Put a 1000pf radial cap on “Normal Volume” pot, on the middle and far left legs. Piggy back a 470K resistor and 470pf cap together. Connect one end to the far left leg of the “Normal Volume” pot. Connect the other end to the input jacks. Like I said, I haven’t yet figured out exactly how to write the docs for how to wire up the input jacks.