On 09/05/2016 12:52 AM, Brasto wrote:
Many Philips radio's are using two different segments of wire on the drum of the variable capacitor to tune to the various stations.
The steel wire type forms one half and the "cotton" tread closes the loop, AM and FM circuit are using the same type of different wires.
The steel part is on vintage radio's subject to corrosion and breaks easily, I found it no problem to replace the steel by a "cotton" type.
Question: what is the reason Philips engineers have chosen for this two type of wire concept?


Most likely to avoid stretch - so the frequency indicator stays true.

There was (is?) a fine braided highly flexible and strong wire that was
used in those days for the same reason. I have an old roll of it in my
shop that is used on jukeboxes for moving various things in the mechanism...

John :-##)
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."