1942 Pair RCA 1633 Tubes 25V version of 6SN7 WWII era matched codes S6

Tested as new old stock at 2500/2500 & 2500/2450 uM micromhos each on a calibrated Hickok 539B tube tester. The minimum acceptable value is 1640 uM micromhos per section. There have had little if any use.

Please note test values may differ slightly from tester to tester and not responsible if your tester reads it differently and/or slightly different values than shown here. Values are added as a means to show the tubes indeed test strong/new, not an exact science. Your results can/may vary.