benecol wrote:
Someone else with the same power switch as me! Thought it was some weird aftermarket bodge, but I've since seen Broncos with this switch. What year's yours?
Also, can any of you afficianados explain the difference between inputs one and two for me please?
Fender, from Leo's era up through CBS production, was always known as using whatever they could get from their suppliers and/or whatever they could find around the shop. They probably got a good deal on those switches, bought some, used them up, and then went back. Or whatever. You just never know with Fender.
As far as the inputs, that's a bit of an interesting thing that's not talked about too much.
Here's a snippet of the very beginning of the schematic:
See that each input has a 68k resistor
Now it was assumed when the amps were designed that anytime something was plugged into input 2, there would be something else plugged into input 1. It was never thought that someone would have any reason to plug into input 2 alone!
So when there is something plugged into input 1 alone, the signal goes through both 68k resistors in parallel, for an actual 34k resistance to the grid of the first 12AX7.
If instruments are plugged into both 1 and 2, the 68k resistors (in theory) isolate the instruments from one another (in practice not so much) and they are mixed together before the first stage.
Now if an instrument is plugged into channel 2 only, it sees a 68k path to the grid but also a 68k path to ground. This results in some of the signal being attenuated to ground, resulting in a darker sound that's slightly "padded down," or lower in volume. So coincidentally, it just so happens to work well to pad down an instrument with a very hot input (i.e. a combo organ or keyboard of some sort) when you don't want it to clip the first tube.
So, short version: hole 1 is normal, hole 2 is padded down for lower input signal and a darker sound.
Thanks guys. 
Feels like the sound is almost too refined with the Weber... maybe i like my amps a little farty 
