What experience have you had with 5814a Tubes?

I prefer the 5814A tubes over standard 12AU7’s in most cases. I’ve used the RCA 5814A triple MICA black plates and they were more engaging and dynamic, plus they have the RCA warmth and extended low-end.

Are you using them in your PrimaLuna? In what preamp position are you using them?

@jbhiller , so very glad to be be of help with the speaker recommendation, and thanks for the kind words. I'll bet that tweak opened up the bass and mids, (I had the older PSB Synchrony's).

Regarding preamp tube rolling, my findings where just like yours are; I mixed it up. I would use a primo NOS in the driver position for flavour, then a different brand or type as the cathode follower.

I know you made a good choice with the PrimaLuna. Enjoy !!