Description

F2a11 is considered one of the best sounding output (power) tubes ever. It was only made by Siemens in West Germany in 1960s and 70s and is now extremely rare, NOS (new old stock, meaning unused tubes) selling for up to $2,000 a pair. Grab a bargain here, these tubes This pair of used tubes was fully tested on Triplett 344 tube tester (using an adapter, since 3444 does not have the required test socket) and in a hi-end single-ended amplifier. They are precisely matched in terms of anode (plate) current (both 34 mA at these test conditions) and reasonably matched in terms of mutual conductance (6.4 and 5.8 mA/V). NOTE 1: The other pair of tubes is also listed for sale, see my other listings ... NOTE 2: The amplifier, tube tester or any other items pictured are NOT included in this sale, only a pair of F2a11 tubes, #1 and #2 on the photos, serial numbers 78184 and 44380. This is a private sale, no warranty or returns.