You are bidding for 1 piece RS683 transmitting tetrode from Telefunken. Tubes were tested on Funke W19 tube tester according 2207 test card setting. I used external DC power supply for tube filament and grounded negative end. This action reduced all measurements compare with AC supply. Test result is 32 mA plate current. Minimum good according test card is 24 mA. Tube is well controlled by first grid without excessive current of G2. All looks fine. Check actual photos for details. Private selling. I’ll prepare good package and post worldwide, but will not assuming responsibility for tube damage during postage due age and gently specific. Payment should be done in 3 days. Bid accordingly with posted above. Contact seller for any questions. Check my other power tube auctions. Happy bidding.

You are bidding for 1 piece RS683 transmitting tetrode from Telefunken. Tubes were tested on Funke W19 tube tester according 2207 test card setting. I used external DC power supply for tube filament and grounded negative end. This action reduced all measurements compare with AC supply. Test result is 32 mA plate current. Minimum good according test card is 24 mA. Tube is well controlled by first grid without excessive current of G2. All looks fine. Check actual photos for details. Private selling. I’ll prepare good package and post worldwide, but will not assuming responsibility for tube damage during postage due age and gently specific. Payment should be done in 3 days. Bid accordingly with posted above. Contact seller for any questions. Check my other power tube auctions. Happy bidding.