Strong gm and plate current. 

Very slightly loose collar, about a mm or 2 of play.

Tests 5500 45 ma where 3900 is good at 250 volts 

in a Triplett 3444/Westmore 501 laboratory tube analyzer restored and upgraded by Paul Hart.

Please see our other items for more vintage tubes & audio.

Tubes guaranteed to test good or may be returned.

We cannot be responsible for what tubes test in another tester or in your gear at *** plate voltage.

We combine orders for shipping.

We don't change values for customs.  

Thank You.