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(!!!!) (Recommended Used Pair) 300B Western Electric used/good 1999 (Serial #219934 and Serial #219921) (49.2ma and 51.1ma) (Tested on Amplitrex AT1000)

$ 1,099.99

1 matched pair) 300B Western Electric used/good (9952=1999) in original boxes, with registration cards

Test Data:

300B REFERENCE NOS TEST DATA:

Vplate=300V, Vgrid=-58, Iplate=60ma  Gm=5500 

Vplate=400V, Vgrid=-80, Iplate=85ma (NOS reference)

 

300B Serial #219934 TEST RESULTS:

Vplate=300V, Vgrid=-58, Iplate=51.1ma (78-82%) Gm=5050 (90%)

Vplate=400V, Vgrid=-80, Iplate=70.5ma (80-82%) Gm=5400

(very small hairline crack in base)

 

300B Serial #219921 TEST RESULTS:

Vplate=300V, Vgrid=-58, Iplate=49.2ma (82%) Gm=5030 (90%)

Vplate=400V, Vgrid=-80, Iplate=68.5ma (76-80%) Gm=5400

 

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