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In Reply to: RE: They are simply blank or have 68HC marked on the tube posted by scruffy_ on March 08, 2017 at 20:06:18
The really expensive NOS Russian 6SN7 equivalent is a Melz Metal base. OK but the key are the plates, they are the hole plate variant. You'll have to get a good pair to decide for yourself if it is what you prefer sound wise
Here is the Melz at the tube store $89.95
The hole plate tubes look like they are made with an Erector Set if you are old enough to remember them. The holes are circular however. I will look for aa link.
I have a few pairs. The treble has a lot of energy and is sometimes bright. The NOS tubes that are still available from Russia and the Ukraine are highly microphonic.
The real McCoy is rarer than the Tung Sol round plates and has 1578 stamp on the glass, heavy duty metal bases, T-shape plates with the holes in the sides, and spring steel plate supports like Tung Sol oval plate construction!
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