$375/pair
Tubes share the same code (12-2), indicating a production date of the 12th week in 1932. I have never seen a cleaner pair of older 45s. A very rare tube! Both have very clear glass with no loose material inside. Tubes were tested for transconductance (results below), gas, shorts and life. These tubes are a perfect match on both transconductance and current draw.
Test Results:
1640/25.8 and 1640/25.8 (transconductance/current draw)
Matched! and near-NOS!
Minimum: 1170 gm [/b]