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56 RCA used/good 1940's (4.7ma) Image 1
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56 RCA used/good 1940's (4.7ma)

$7.99 $8.99


Tags:

1943 56 all black plate Sylvania triode


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Preamp tubes
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  • Description

56 RCA used/good 1940's

4.7ma

Gm=1200

 

 

Tested on Amplitrex:

Vplate=250V

Vgrid=-13.5V

Iplate good range = 4.5-5.5ma

Good used Gm=1200-1300

(Vfilament = 2.5 volts)

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