06-28-2014, 10:11 PM
Mike,
I don't know why Philco insisted on using switches for their tone controls, it rather limits your options, in this case three positions but some only have two. The way they work is strange, they typically have three or four caps, one always stays in series, the other two or three are connected in parallel and are shorted out as you rotate the control, or vice versa. The one on my Philco 3118 has the shaft broken off so I have two options, replace with an aftermarket rotary switch and recreate the original hookup, or just junk it and put a proper linear pot in there.
Compare this setup to a Canadian Westinghouse console I have, it has a tone control pot, and a tone control switch. The switch gives you three ranges bass, medium and treble, and the pot allows you to adjust it anywhere in between. Did I mention that this was also a five tube console, shame on you Philco!
Regards
Arran
I don't know why Philco insisted on using switches for their tone controls, it rather limits your options, in this case three positions but some only have two. The way they work is strange, they typically have three or four caps, one always stays in series, the other two or three are connected in parallel and are shorted out as you rotate the control, or vice versa. The one on my Philco 3118 has the shaft broken off so I have two options, replace with an aftermarket rotary switch and recreate the original hookup, or just junk it and put a proper linear pot in there.
Compare this setup to a Canadian Westinghouse console I have, it has a tone control pot, and a tone control switch. The switch gives you three ranges bass, medium and treble, and the pot allows you to adjust it anywhere in between. Did I mention that this was also a five tube console, shame on you Philco!
Regards
Arran
