George,
Thank you for your reply. After a total of 6 hours searching I just found a seller on the auction site listing Plessey Prescaler/Frequency divider IC's. In the description he listed theSP6806B. He stated that the IC's were NOS from Watkins-Johnson and he is located in Morehead Kentucky, United states. The price is $9.50 each IC. I ordered 2 and will replace the bad one in about 2 weeks.
This may be the last problem for the 8656A. I will then move on to the stack of more than 50 pieces of test equipment. That is not counting about 30 Tektronix 7000 plugins.
Richard? WB4RSO
