FS: Ballast tube

[George Babits]

I have a pair NOS of Clarostat "Resistor Tubes"  10-23-a.  What little I can 
find on the www indicates this is a "universal ballast" tube.  They are 
metal "tubes" with octal bases.  I have no further information on them. 
Sell the pair for $20.00  post paid within the US.
Thanks for looking,
George
W7HDL

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