Robin,
This may sound gross but I have a near mint 7704A that I bought for less than the value of the 7T11 sampling timebase that came with it. Since it is the only one of my 7000 frames that splits in half it is the only one that can go in the attic for storage. What I was suggesting is a straight swap of my 7603 for your 7623A, that way we both have one in - one out!
Regards,
Roger
