1953 Matched Gain Pair, Welded Plates 6SN7GT. 

Test 1637/1845 & 1870/1833 gm where min is 1150 and typical New is 1700+ at 200 volts in a Maxi-preamp 2.

Gain is 19.4/20.7 & 20.3/19.6 where typical new/nominal is 19.

Listening tested in a custom single tube headphone amp.

Excellent sound. Having finally listened to these, they are great. Musical and sound very much like early-mid 40's Sylvania to me.

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