London Power 3 channels amplifier project

[Vostre Roy]

Hi Vostre
I wouldn't use an ON-ON-ON switch as that is likely to be expensive or not exactly what is needed. The C&K 7211 can be wired as a 1P3T switch (like the T-U-Ps on my older amps), or as a A,A+B,B switch ala Gibson guitar pickup selector. It's a great quality switch, as are all the C&K 7000-series devices but it is very expensive.
I usually opt for a less expensive switch, such as a SPDT with centre-OFF (7103-SYZQE for panel mount and solder lugs).  Depending on the circuit switching requirements, wiring the relay contacts in a specific fashion will give the 1-of-3 selection/muting as needed. More reliably, using a few BJTs to interface provides the distinct 3-way output needed. Instead of BJTs, one could use CMOS gates but you still end up needing BJTs to drive the relays. With any of these solid-state interfaces, it is a lot easier to build if it is on a PCB - even with just the relays a PCB makes things neater.

Oh I think I see what you mean, for some reasons I forgot that the clean channel was in the N/O position of the first 2 relays, which means that the picture above should be the way this switch is wired, right? (I know that they actually connect to the footswitch's poles but its just to be sure I understand that part right)

Edit: Oh and yeah, drew that super fast and forgot that when the switch is on the "up" position, the bottom lug connects to the middle lug and vice versa. Meaning that the lead would be on the "up" position on that drawing and the overdrive on the "down" position.

[attachment=23]

Regarding the Body Control, I thought about it while reading the PA-66 documentation but decided to not use them because the amplifier will be versatile enough for my needs with all the controls that I have planned on it already.

Cheers and thanks again for the help!