(!) (Single) 37 Philco by Sylvania smooth plate tests like new 1940's (8.3ma)
$ 21.99
37 Philco by Sylvania smooth plate tests like new 1940's in white box
8.3ma
Gm=1100
Test parameters:
Vplate=250V
Vgrid=-18V
Iplate good range 6.5-8ma
Gm=1000-1100
(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)
See more: vacuum tube
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 (Single) 37 Philco by Sylvania smooth plate tests like new 1940's (8.3ma) "Pin It")