Lost left channel after shunt regulator install

Good to know!    Would it be best to use a similar ceramic resistor or would a 5W wirewound like this be ok?
https://www.mouser.com/ProductDetail/Vishay-Draloric/Z34081832209J6DC04?qs=sGAEpiMZZMvNd0dY0KymzkXrYz8I%252Bic576HS3yycCw8%3D
 
The 5W rating is pretty overkill, especially in a 2A3 amp, I wouldn't hesitate to use something like a PR-02 or PR-03 from Vishay.  The 5W parts we provide are super easy to install, and they sit on top of the hum pot cleanly and have a lot of space between the leads and the edge of the body of the resistor, which prevents what could be a catastrophic short if those leads touch the body of the hum pot.
 
Awesome,  I think the layout will be perfect.  I can use the input side for a line out DPDT switch and figure out a good spot to put the extra pair of RCAs and use the power side for a 4pDT 8/16 Oh impedance switch. Should be able to get by with only one v.s. the twin switches for 2-4-8-16.  Would be cool to find a place online who makes custom faceplates or silk-screening and do a pair of switch surrounds to match the trim plate that comes with the mourquiet upgrade.  I'm liking it :)

What amp rating would be safe for the 4PDT impedance switch? 
 
I've used Front Panel Express for my personalized BH plates / overlays. No skin in the game, and maybe not the cheapest, but I liked the interface and the service.
Karl
 
What amp rating would be safe for the 4PDT impedance switch?

Looks like 1 amp leaves you with some headroom. Pretty much any switch meant for AC should work fine
 
Though the amp is capable of more current on the speaker posts than 1A, in reality you aren't going to be toggling this switch a ton, and equally unlikely will be flipping the switch with the amp running at near max power.
 
I got this for the impedance switch. Only 1 4PDT to do  8/16 https://www.mouser.com/ProductDetail/506-MTA406N

and this for the signal / line out https://www.mouser.com/ProductDetail/506-MTA206P

Both gold contacts rated for 6amps.
 
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