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(!!!!) (Best Value Pair) 300B Western Electric used/strong 1997-1999 (89ma and 92ma)

$ 599.99

1 pair) 300B Western Electric used/strong 1997 and 1998 in JJ electronic boxes

1 tube 1997)  Serial #212203 faded getter

1 tube 1998)  Serial #211916 faded getter

 

300B REFERENCE NOS TEST DATA:

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

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

 

PAIR TEST DATA:

300B Serial #212203 TEST RESULTS:

Vplate=300V, Vgrid=-58, Iplate=89ma (100%) Gm=5700 (100%)

Vplate=400V, Vgrid=-80, Iplate=123ma (100%) Gm=6200

 

300B Serial #211916 TEST RESULTS:

Vplate=300V, Vgrid=-58, Iplate=92ma (100%) Gm=6000 (100%)

Vplate=400V, Vgrid=-80, Iplate=125ma (100%) Gm=6600

 

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