37 Philco Balloon used/good 1930 era (6.5ma)
By Tube World
$ 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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