Posted by Tnuctipun [ 172.146.114.215 ] on March 05, 2005 at 13:59:11:
In Reply to: Re: Guinevere - Next step? posted by colinhester on March 05, 2005 at 13:30:13:
Here is a link to soem CCS schematics. Rev 4C at the top of the page is what I am suggesting.
There is another similar valve to 1619. the 1624. Same specs, but 807 glass and anode cap. The sheet says refer to type 1619 for plate curves...
I can certainly relate to the metal can sentiment. Glowing stuff does add to the appeal.
I am working on various amp designs. I am trying to root out any hidden troubles, and find a best selection of parts.
Let's not forget the 300B. that's a pretty fine valve, and not much more demanding than a 2A3. Slightly bigger PS( KT88 sized ). An 8-10k chunck of output Iron will work well for both I think.
there is something to be said for PP, class A, DH triodes.
As to Guinevere gain, I do most strongly suggest punching another 9-pin socket in and trying the 12B4. Everything else is going to be transferable, save adding 2 more LED's in the cathodes. I do hate wasting gain...
regards,
Douglas
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