Another Sylvania 6SN7GTB? No, as pointed out by Triod750, this is a single and not dual triode - it is a Sylvania 6J5WGT with extra (disconnected) hardware inside.
I am curious how this came about. You would expect a single triode to have just one plate:
Here is a Sylvania 6SN7GTB tube:
But what is this?
Another Sylvania 6SN7GTB? No, as pointed out by Triod750, this is a single and not dual triode - it is a Sylvania 6J5WGT with extra (disconnected) hardware inside.
I am curious how this came about. You would expect a single triode to have just one plate:
I have a pair of these as well and was mega-confused when inspecting the tube for the first time. I stumbled on a bit of info half-way down this page on why they might have done this:
“If you look closely, cathode and grid are only assembled inside one of the plates. It is better visible when the tube is lit up
Obviously the same tooling and internal structure as for the 6SN7 was used, they kept the second plate inside for mechanical stability, but left the cathode and grid out.”
If I had to hazard a guess I would think it could also be related supply chain efficiency, with less unique parts to manufacture, stock, and assemble. Interesting tube but too bad they don’t sound very good…
I used to have a pair of Sylvania 6j5s that sounded phenomenal, except for a pretty strong buzz. I tried to re flow the solder, but ended up killing the tubes instead.
In my attempt to get another "magic" pair of Sylvanias, I mustve bought 8-10 pairs of 6 and 12j5s....all of them sounded pretty bad.
To this day I have no idea what made that one pair sound so good and the rest were not. Oh well....
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