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(!!!) (Engraved Base Single) 2A3 RCA Cunningham Radiotron black plates engraved base used/very good 1930's (93ma)

$ 109.99
 
1 tube) 2A3 RCA Cunningham Radiotron black plates engraved base used/very good 1930's in white box, (4) springs at top hold filaments in place - large shiney getter - in white box

 

SINGLE TUBE, NOT A PAIR

 

Test Data: Vplate=230V, Vgrid=-30V

Iplate=93ma Gm=5300

Good NOS range 80-120ma

 

Test Data: Vplate=250V, Vgrid=-45V

Iplate=52ma Gm=4400

Good NOS range 50-60ma

Recommended for

Tektron, Melody, Bottlehead, Ming Da, Musical Paradise

 

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