[Premium-Rx] WANTED: 20 turns precision potentiometers

[dd3ly at arcor.de]

Dear Greg, 

please place this at Premium-RX, 

thanks, Andreé DD3LY



Dear List members,

I am looking for 20 turn precision potentiometers. Surely you all know those 10 turn potentiometers which are normally used in test equipment. These 10 turn potentiometers are about 1 inch in diameter and 1.5 inches long. 

But what I am looking for, are precision potentiometers with 20 full turns, each turn with 360 degrees. Such 20 turn potentiometers have about twice the length of a standard 10 turn potentiometer. I own one 20 turn potentiometer wich I took from a Varian SHF downconverter. So these potentiometers really exist! But even the one I own is defective :-(

I would like to find three or four 20 turn potentiometers, which may be used but should be in good working order. The value of the maximum resistance is not really important, something between 1k and 100k will be OK.

The reason why I look for these is that I want to use them as a servo position indicating potentiometer in a modified professional preselector where two variable elements are motor driven. There were plastic gears between the main axis and the position potentiometer. Both gears are defective now and cause faulty position indication. If I place a multiturn potentiometer with 20 full turns on the main axis, all tolerances will be reduced to ZERO. This would be fine.

Thank you for digging through your "junk boxes".

With Greetings from North Germany

Andreé DD3LY