12AU7 Genalex or Psvane for Cayin Hybrid Integrated H80A

another one to consider is the Raytheon black plates. They are open and extended without any brightness.

In most apps, the 5814 should be an ok sub for a 12AU7,
RCA black plate 5814s are also nice sounding tubes.
Not knocking the GLs at all. They are nice tubes, just a bit different sound than the others. Also don't forget the orig Mullard UK ECC82s and Bugle Boys out of Holland. Both are nice tubes.

@ericjcabrera,
I receive the Genalex Gold Lions and installed them in my preamp. Even though they are new, they sound more "lively" with a much better presence than the Mullards that came with my preamps. Not that the Mullards sounded hollow, but the Genalex sound more full bodied.One of my misconceptions with "tubes" were that they were "delicate and could be easily shattered". Man tubes are sturdy. I was a bit worried to "rock and shake" the tubes out of the sockets to remove them. Similarly to put them back, you have to do the same and keep pressing them "in" so that they "fit right".

Anyone that doubts runin time on tube ,cables ,or electronics ,
Have either a hearing problem, no experience or both !!