Got it.harddriver wrote: ↑Sun Jul 03, 2022 4:11 am If you are going for EVH stuff the EH6CA7 are the closest to actual Sylvanias they just need to be burned in good to weed out the initial mortality tubes.
The EH's are beam forming element tubes just like a 6L6 and NOS 6ca7 tubes under a heavy vaccum as well. I ran a quad in my 69 and they sound just as good as my Sylvania's to be honest.
If you are a EL34 fan then the EHEL34's are super reliable these days and pretty much a clone of XF1 Mullards, Dave F uses them in his new production amps for a while now.
I find KT88's sound more like a big EL34 versus a 6550 which are like a big 6L6.
For 12ax7's I would go Tung SOL reissue on V1, Ruby HGAC5 Chinese 8th Gen for V2 cathode follower, Whatever your favorite PI tube is, alot of people like the Sovtek LPS but I like NOS Sylvania 12ax7.
2 out of 3 of the filter caps are original (circa 1989). I have one on hand, so when I order tubes I'm also gonna order another 50/50 500V F&T filter cap.
The original choke is riveted into the chassis, so I gotta drill out the rivets to get it outta there.