Sylvania JAN-CHS-6SN7W Black Base (Pair) [Template]

Brand new pair of rare 6SN7W JAN Sylvania black plate clear-glass,
black base, heavy top getter flashing in original military boxes. (Not to be
confused with the 6SN7GT
Sylvania Chrome Top, which are much lower quality.)  

New Old Stock (NOS) original
military box. Very fine sounding, very rare black plates from the 1940s.
These beauties were made for radar equipment, and should function for a very
long time. This is the rare early 1940s version of the military 6SN7 that
predates the brown-base series, this version just slightly later than the
nickel base version (which are unreliable). Tested each of them in my preamp
and there was no crackling or hum whatsoever. 

I have two pairs total for sale. They usually go for $215.00
to $300.00 new, per pair, when available.