[Elecraft] Unknown Schematic Symbol - Need ID

[Mark A. Sandler]

Hello Fellow Elecrafters:

I'm in the process of trouble shooting and repairing my switching power
supply.  One of the damaged components has a symbol on the schematic that
I'm not familiar with, and does not show on my "Handbook" chart of
schematic symbols.

I believe it is a temperature variable resistor.  The symbol looks like a
resistor with an oval around the squiggly line.  It has two leads.  The
part is marked TH4 - 6.8K.  There are four of these on the power supply
board...TH1 to TH4, with varying values.  

Any confirmation of my analysis??  What are they called??  Can you get
them at Radio Shack or another "local" electronics parts stores??

Thank you in advance, 
Mark - K7MAS
K2/100 #874




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