Not currently tested.But represented to be in new working condition. There might be issues that I am unaware of. I am not here to rip you off.
Testing: These tubes are being sold strictly UNTESTED . The glass envelopes are clear and free of cracks.
This is a classic military/industrial grade "JAN" variant (Joint Army-Navy) made in the USA. It features a unique 40 KV Max High X-Ray Output marking on the glass. The Eimac 4-125A is a tetrode tube.