Item: Matched Pair RCA 12BH7A Double Triode Vacuum Tubes Condition: These tubes are NOS / NIB. They have grey plates with Top " O" getters. They are date matched DW (June 1972) and manufactured in USATesting: These tubes have been tested on our calibrated Hickok 600A for Shorts, Grid emissions and Mutual conductance. The acceptable range for thesetubes are 2380/2390 gmNote: This Hickok 600A tester was recently calibrated in 5/20 by Mr. Jim Th...orusen, Central Coast Electronics, Lincoln City Or. Test Results: Tube 1 = 2100/2200 Tube 2 = 2100/2325Warranty: All Used tubes are guaranteed for 30 daysUS Shipping: Shipping is First Class USPS.InternationalShipping: Shippingis calculated with International First Class USPS