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(!!!!) (Best Single) 420A Western Electric NOS 1977 (2.2/2.3ma) 1-2% section balance Image 1

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(!!!!) (Best Single) 420A Western Electric NOS 1977 (2.2/2.3ma) 1-2% section balance Nav Image 1

(!!!!) (Best Single) 420A Western Electric NOS 1977 (2.2/2.3ma) 1-2% section balance

$59.00 $69.99

Tags:

1950's 1979 420A 5755 preamp tubes Raytheon Western Electric

Categories:

Western Electric

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Description

1 tube) 420A Western Electric NOS 1977 1-2% section balance

1 section) 2.2ma Gm=1600

1 section) 2.3ma Gm=1600

Tested on Amplitrex

Vplate=180V

Vgrid=-.1V

Good mA = 1.4-1.8ma

Good Gm = 1300-1500

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