[John Stone]

On 7/13/10 6:11 PM, in article
,
"Shhhh!!!! I'm Listening to Reason!" wrote:

6U8 (Scott used these a
lot), 6GC7/6FQ7, 12A*7 and the like are "phooey".

6U8 and its cousin 6GH8, both of which were used extensively in tv
applications, are now being used to replace the difficult to find 7199 in
old Dynaco and other gear. Apparently the 7199 was little more than a 6GH8
with different basing and a spec for noise. There are plug in adapters
available or you can just rewire the socket. The subs yield equal or better
specs compared with the original tubes.