You are bidding on a pair of Sylvania type JAN CHS 6SN7GT radio/audio tubes made for the US Military as type VT-231.  On my Amplitrex AT-1000 tester they test as nearly new, one at 93% of the specifications for a new tube for emission, Em, and 100% of the specifications for mutual conductance, Gm on one plate.  The other plate tests as 100% Em and 103% Gm.  The second tube tests at 100% Em and 92% Gm, on one plate and 82% Em and 92% Gm on the other plate.  So they both test strong, and were likely installed in a piece of military equipment which never saw any use. They should make an excellent pair.  They are nearly identical tubes.  They should be great for your amplifier.   Shipping weight is 8 ounces. No shipping to China.  Please see my other auctions for more interesting radio and audio items, and tubes.

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