Preamp Deal of the Century

Hi Slowhand, Here are some pictures of the Tung Sol Round Plate tubes grouped with some other tubes:

Photo One

Photo Two

The images are not terribly high resolution but might give you some idea of what to look for. Look closesly at the tops of the tubes to see the U shaped plates which are visible in Photo Two - at the very top of the tube - above the Mica spacers.

Thanks Bwhite,

It is the round plate that I have. I have paired these with the Sylvania 6F6G tubes that Ecclectique recommended and this seems to be the magic combo in my system. The strongest, most tuneful bass I have heard in my system, but not at the expense of mids or highs. Cymbals have a beautiful shimmer, drums have a nice crisp snap, brass has that nice burnished sound and the mids are clear as a bell. I have had 1944 Sylvania VT-231's, Ken-Red Black Glass, Neotron's in the line stage, but the Tung-Sol round plates make the best combo with the 6F6G's (for me).

hello Lisbon. The original 6f6 valves[power pentodes] date back to the early 1920's and were actually first produced in all metal form and looked similar to the early 6v6 metal valves that are so common in early guitar amps.Do "not" use these metal types as they do not sound the same. To the best of my knowledge,the 6F6G [Shoulder shaped glass vavles] were produced from the late 20's through to the early 40's. The tube was produced by either Sylvania or National Union and rebranded for many radio companies of the day. Mine say Rogers,however I have also seen them labelled philco,electrohome,RCA,westinghouse etc.There are also quite a few different versions of the 6F6g's with different looking plates and internals.The ones that I am referring to had rounded black plates like the Western Electric 350b.I have seen many with flat black plates as well. I am not sure if I can post a picture on this thread,if you want to see a picture of the internals of this valve,I can e-mail you one off-line. Cheers David.

Hey Bryan.Tell me how you post pictures on this thread?

Photos of the 350b and 6F6G courtesy of Ecclectique!

Photo One showing 350b and 6F6G

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