Subject: Re: tubes??? 4CX250F Date: Fri, 23 May 1997 15:51:56 -0700 (PDT) From: "Edward V. Phillips" <ed@alumni.caltech.edu> To: tesla@pupman.com Those things (4CX250 series) are kinda fragile and take a good blast of forced air cooling. I'd stick with the big filamentary triodes, which are plenty rugged, rather than use an oxide-coated cathode. Ed