board removal technique

[daniel]

silly question from a newbie. I have a layout all drawn up to change the vibrato channel of my 68 bandmaster to a tweed bassman preamp. now for the silly question. what is the best way to remove the board to do this? Do you leave the wire attached to the board and disconnect them from the tubes,pots etc. or vise versa. My logical guess is to leave them connected to the board since they have to be soldered under the board. One more thing, I'll have to scan my layout later, the stock vibrato channel goes thru a .1uf coupling cap into a 220k resistor to the phase invertor circuit. A tweed bassman goes from the middle lug of the treble pot into a .02 capacitor into the pi circuit. On the new channel can I go from the treble pot directly into the 220k resistor or do I need to add the capacitor?

[flemingmras]

The best way to remove the board from any Fender amp is to unsolder the wires from the pots and tube sockets. That's what I had to do when I redid my '65 Fender Pro Reverb.

Also, on the Bassman circuit you can omit the .1uF cap. The reason that's there on a Bandmaster is to block the plate voltage from the last gain stage on the vibrato channel from the input to the phase inverter. I personally see no point in that cap since the input cap on the phase inverter does the same thing. But if you connect the center wiper of the treble pot directly to the phase inverter, the tone stack caps block the DC voltage coming from the cathode follower from reaching the phase inverter input cap, which also blocks DC as well.

Hope this helps.

Jon