Stereo speakers rocker switch

[Thompson]

At our cottage, we have a stereo in the living room, on the deck and out by the covered firepit. Way too many stereos, cables, remotes, etc. What I want to do is have one stereo (living room), a rocker switch panel, and then wires out to speakers to all these locations. I feel I need rocker switches with 4 pins, but can only find 3 pins. Rocker switched with 4 pins would be for the stereo wires (pos/neg) going into the switch, then stereo wires (pos/neg) going out to speakers.
So, I guess my question is, am I doing this correctly? Is there an easier way?
Thanks for any help.
Cheers

 

[Lucien Nunes]

It's tetrode output, with a separate rectifier and HT rail for the screens, fixed bias nearly -80V and a 6SN7 as cathode-follower driver. The grid current is pretty horrendous at full welly.

I should fish it out and fix it. I have 197 other projects and 0 time, but it would be fun. I'm also about to move my bench into a different room and it will come to light in the process.

OP, sorry, drifting a bit here!
[automerge]1593204387[/automerge]
Ha, found a pic of the PSU before I took it apart, sans lampes. They would be an 83 mercury vapour rec for the main HT (note ceramic UX4 socket), a 5U4 for the G2 / driver supply and a 6X5 for the bias. Main HT transformer came from a WW2 submarine.

The 7-pin O-Z socket connects to the amplifier, with 550V, 350V and whatnot accessible on those uninsulated contacts. I didn't then know that there was supposed to be another paxolin insulator that's missing from this socket. It didn't worry me at the time because I was going to include a pilot circuit with a relay that only grounded the HT secy CT once the neg bias was proven at the far chassis. but that bit never got finished. I got worried about the ground pin going O/C sending the amp chassis up to HT, and doubled up with what was going to be the pilot pin.

 

[DPG]

Jeez that transformer looks huge.