Pilot and 3rp1 ?

[Dave S]

I have heard that a 3RP1 can be subbed for a 3KP4, with some extra expenditure of effort, but haven't monkeyed around with that yet myself. There are also at least two different versions of the 3RP1. The standard one, and a shorter one also identified as DG-32 or CV2431 that was used in the Marantz 10B tuner. A standard 3RP1 will not work in the tuner. I assume that they are electrically identical, but don't know that for sure.