I picked up a really cool Revox B-760 (I know, cool and Revox is redundant) that needed a little love. Problem #1 was that the tenths digit on the display would show 0 & 8 instead of 0 & 5. The driver chip was an 9317BPC (no cross reference found). I looked through the data sheets and decided that an SN74LS47 would do the trick. After pulling out the suspect IC I installed a socket just in case I was wrong (yeah, that's happened) and installed the replacement. After reassembly it worked! Next problem is that the signal strength meter doesn't work. I poked around (and recapped) the logic board but have yet to locate the problem - I'm thinking it's either the meter movement or the driver transistor. I also used some deoxit on the adjustment pot. Finally I recapped the audio board - replacing all of the tantalum with audio grade Nichicon electrolytic.