I like the GE 6201/12AT7WA. You have to buy them tested, in the reverb circuit, because some are microphonic or noisey. I also like them in the phase inverter for a warmer tone. The RCA 6679 is also a good choice for the reverb send.
I need to order some of these from you Mike. Is there as good a bargain in ax7 tubes as well?
You can get a NOS JAN Philips 12AT7 for $12. It seems pointless to me to save $2 and use a piece of garbage.
I've been telling folks for years (and practicing what I preach): For a Fender reverb driver the best choice by far has been a JAN/Philips 12AT7WC.
They sound just fine for this application, will take the abuse for years, are still plentiful, and in many cases are cheaper than new production.
I found some NOS Sylvania AT7's at a local hospital and tried it in my '68 PR. Seems to be working and actually seems quieter that the RCA that was in there. I quess time will tell how it holds up!