When I was involved in these things as a consumer (ABC-TV 1974-1981) we 
spec'd Penny and Giles exclusively. At McCurdy (1981-1983) we used Penny 
and Giles and later some Panasonic clones of P&G. But, at $100 per 
fader, in quantity, back then (more or less), they really drove up the 
cost of consoles and certainly weren't sustainable when you can buy a 
24-mic-in plus four stereo line input Yamaha console for $1400. Who 
cares if it breaks after a year or three, especially for TV.

Langevin had early slide faders in the 1960s, but I don't know prior to 
that. Here is an interesting report/analysis by Rick Chinn of a 1965 (I 
know 15 years later) Langevin console.

I think Ward Leonard had slide rheostats used in engineering labs and 
adopted to light dimmers well before 1950, but they were on a larger 
scale. Daven made a few slide faders, I don't know if they made them 
prior to 1950. There's one up on eBay at the moment 180855926717

One company that I'd look at is, I think, British, Painton (sp?) that 
made arc-form (quadrant) faders (rather than linear) and these were used 
in early BBC consoles as well as lighting consoles, IIRC. shows some.

Another company, and I think it was a Steve Temmer import, was Danner 
from Germany.

While the 1950 patent is an interesting and important piece of art, I 
think more searching might be useful to better understand the history of 
the linear fader.

I never considered the slidex to be useful and Bob Bloom hated my specs 
that specifically excluded that device. The Tascam string on rotary pot 
was also excluded. I forget how I worded it, but it was something about 
a slider on a linear resistance element rather than a conventional 
rotary pot with a mechanical motion translator to linear.

I think I have a quad P&G linear fader here still.



Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada           (905) 713 6733     1-877-TAPE-FIX
Quality tape transfers -- even from hard-to-play tapes.