[Drake] RV75 -- Help!

[Arthur Delibert]

I have an RV75 synthesized VFO that has suddenly stopped tuning up in frequency.  No matter which way you turn the knob, the receiver tunes down in frequency. 
 
The problem appears to be in the optical switches on the encoder shaft, as voltage measurements indicate that one of the photo-transistors is not turning on when it should.
 
Does anyone out there have replacements for these optical switches (OPB813S-10)?  Searching on-line indicates that a parts source might have them, but they seem to have a very high minimum order (but still less than the price of the RV75!).
 
Many thanks!
 
Art Delibert
KB3FJO 		 	   		  
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