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37 Philco Balloon used/good 1930 era (6.5ma)

37 Philco Balloon used/good 1930 era (6.5ma)

$ 19.99

37 Philco Balloon used/good 1930 era

6.5ma

Gm=800

 

Test parameters:

Vplate=250V

Vgrid=-18V

Good NOS Iplate Ma range = 6.5-8ma

Good NOS Gm=1000-1100

 

(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)

See more: vacuum tube
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