Quote Originally Posted by REXTON View Post
You might want to consider replacing those black base 6SL7's with the superior specification RCA 6591 red base. I had my Croft modded to accept these alongside being backwards compatible with all other 6SL7 variants. There is also another mod with each valve receiving a regulated power supply (a little over my head). Just an idea for you.
Hi Andy,

Thanks for the tips! If you look, however, at the valve to the left of the two RCAs in question, you'll see the red base... Yes, it's a 6591!

So yes, I know what you mean, they're superb, but I prefer the RCAs on the phono stage. They're not just any old RCAs, btw, but military-spec VT229s - early ones too, found in an ammo box in the States from WW2. I have all the documents. Early valves like that, from the 1940s, usually always sound best, and these ones are superb.

In the Croft I use a mixture of 6SL7s from different manufacturers, all carefully selected in specific positions, so that I obtain the best of their sonic signatures. Trust me, I know what I'm doing

Noted on that mod for the Croft, yeah I've heard Glenn mention something about that. There are a few more things I could defo do to mine, but am in no rush to fiddle, as I'm very happy with the sound as it is

Marco.