sweep tubes and audio application?

Milbert and Berning amps use the 6JN6 tube. NOS are still $4-5 each, often a buck a piece at ham shows. After many years of use, I've never had one go bad.

John C.

The Berning 2100 and the Counterpoint SA4 both used the now ridiculously expensive 6LF6 (though it is a very nice output tube). Expect $80-$100 per tube for NOS; you have ham operators to thank for the price.

-Richard

i thank u all...

The 6LF6 was used by Futterman in some of his OTLs. They have high-current low-voltage capability. They have become rather expensive as they are no longer made.

These days the EL509 is the tube that replaces the 6LF6 although not directly. It is a powerful sweep tube and is also used in OTLs. There is a non-plate cap variant that could be used, but FWIW the KT90 was developed from this tube, so if you really want something like that the KT90 is probably the place to look, as the design of the amp is made simpler by having no plate caps and the use of octal sockets.

Thanks!

I appreciate the clear and concise explanations. Just the info I was looking for, no more no less.

I've come to despise ham radio explanations on certain information. They are almost always too wordy, and poorly written. Often, in their attempts to appear intelligent and articulate, they achieve neither.

Thanks again