Electrosil resistors 1

[Electrosil69]

thread240-221138
I worked for Electrosil from 1969 to 1971 and remember the TR type resistors. They were glass "cane" coated with tin oxide. A "thread" like that on a bolt was cut into them to create the resistance value and then they were covered in paint. The final coat of paint was the resistor code BBROYGBVGW. The resistance value was determined by the pitch of the cut thread. The TR numbers were the physical size of the resistor body. I think I still have a tin of the in my garage! I hope this helps original poster awood.

 

[Pud]

These make "odd / specialist" resistors:

http://www.welwyn-tt.com/

There are probably others...

H

www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

 

[ScottyUK]

I used to work there. The normal resistors are made by odd people, and as for the odd resistors... ;-)

 

[MacGyverS2000]

An answer to a 4-5 year old thread... don't see that often ;-)

Dan - Owner

http://www.Hi-TecDesigns.com

 

[LionelHutz]

awood last logged on Oct. '09. I doubt this will be much help to them.

 

[Pud]

Oh well, might be useful to future generations...
Four years is not so long to us Brits...
H

www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

 

[Electrosil69]

Yes ...... A thread from the past, but spotted when I signed up a few days ago. "Better late than never!"