reverb tube

[joesatch]

every schematic i've come across have the reverb driver and recovery triodes on different tubes. is there a design reason for this or just the way the layout of a circuit came to be?  Any issue having the reverb driver and recovery using the same tube?  Ex. driver V4A and recovery V4B

[HotBluePlates]

It's happenstance, and driven by where you're looking.

Plenty of folks in this forum have used a "one tube reverb" where the driver and recovery are in the same envelope.

Ampeg did onboard reverb in their Reverberocket amp before Fender.  There is a 6SN7 (V3) that does drive and recovery in a single envelope.