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(!) (Pair) 37 Philco engraved base 1930's used/test strong (6.8ma and 7.6ma)
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(!) (Pair) 37 Philco engraved base 1930's used/test strong (6.8ma and 7.6ma)
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(!) (Pair) 37 Philco engraved base 1930's used/test strong (6.8ma and 7.6ma)1 pair) 37 Philco engraved base 1930's used test strong 1 tube) 6. 8ma Gm=900 1 tube) 7. 6ma Gm=1000 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)
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1 pair) 37 Philco engraved base 1930's used/test strong
1 tube) 6.8ma Gm=900
1 tube) 7.6ma Gm=1000
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)
(!) (Pair) 37 Philco engraved base 1930's used/test strong (6.8ma and 7.6ma)
Item no
:
45799865903
US$ 29.99
Pay in 4 interest-free payments of $7.50 Learn more
Min. order:
1piece
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
US$40
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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