Old stock. The tubes are new and never used
Soviet direct drop in Upgrade for stock Chinese 6J1. Fully Bench tested
Best 6J1 upgrade valves available
Same Date
"Voskhod" factory (rocket logo)
OTK marked
We test our tubes from this type on High-End Soviet Military Tube Tester: L3-3
Measured parameters attached to each tube, difference < 3%
on the photo shows an example of tubes with parameters,
if you need actual parameters, please ask
Lot of 2 (Matched & Balanced Pair)
The Same Tubes with shipping from the USA: