Hello
My experience with my PR99 has been great, I was lucky enough to get mine for $400 new in the box.
It had been stored for a while, and I havent found a single problem with the machine. It is working perfectly.
The PR99 I have is a MKll high speed half track.
The price seems a bit high, I think $800 is more reasonable if the machine is in good condition, well maintained with good heads but thats just my opinion.
Parts for Revox are expensive, so if it needs work it aint gonna be cheep.
JM Tech has always had or been able to get any part I have ever needed for my A77,B710, and G36 recorders.
The A77 15 ips is pretty rare, the capstan motor mount points are different on the 15ips deck, so you cant just change the capstan shaft on a standard deck.
Anybody correct me if im wrong on that, I have seen different motors on an A77.
My understanding is the 15ips motor is offset a few mm to keep the tape path gemoetry, because of the thicker capstan shaft.
bob