Wasn't here for a while... nice discussion
Something about the 5F8-A High Powered Tweed Twin. I just build one of these. Amazing amp, sound wise it's already deep into Marshall territory, especially with the right speakers (I use Celestion V30 and G12H30). Keith's speaker also look like Celestions (and sound like). With Jensen P12N it stays more "tweed". The circuit is very close to Marshall Bluesbreaker (this one got tremolo) or Plexi (solid state rectifier) amps with only a few differences (tone stack).
If you want one, get the Bassmann-Kit from Nik and build it into a 2x12" cab. Nik's output tranny supports different impedances if I'm right. And forget about the two extra output tubes, you won't need them. Mine is incredibly loud even with 2 tubes pulled. It usually starts feedbacking itself when set on about 9 no matter what tubes I use. I run it with a power soak now.
One question about Nik's 5E8 kit: Does the chassis have the same dimensions as the Dizzy30? Thinkin about gettin the 5E8 and puttin it into the Dizzy's headshell. The dizzy would become a 2x12" combo. Other kit's from Nik that have same dimensions as the dizzy chassis?
Greetings...