yeah; the Drake TR-4 used three 6JB6's; they were surprisingly rugged for
sweep tubes.  the originals are still in my unit which I bought new in
1970.

Mike Freeman < K 7 U I J >
"All men tend to become that which they oppose." - Laurence van der Post

On Fri, 22 Nov 2002, Steve wrote:

> Yeah, those sweep tubes were pretty sensitive; but they weren't as expensive as
> some of the other power tubes. I had a Hallicrafters SR-400A which used a pair
> of 6dk6's as the final amp.  It upt out I think 300 Watts and 450 PEP.  The
> first time those tubes failed, I was shocked when I took them out to see that
> the envelop had caved in on one side due to the excessive heat.  After that, I
> put on miffin fan on the top of the final cage to keep them cool!
>
> Steve
> [log in to unmask]
>