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(!!!) (~ Best 7788 Pair ~)  7788 Amperex USA NOS gold pins NOS same build 1973-1980 - strong pair (48ma and 49ma)

(!!!) (~ Best 7788 Pair ~) 7788 Amperex USA NOS gold pins NOS same build 1973-1980 - strong pair (48ma and 49ma)

$ 74.99

1 matched pair)  7788 Amperex USA NOS gold pins NOS same build

1 tube) 49ma Gm=57,500 (1973) JAN-7788

1 tube) 48ma Gm=55,000 (1980) 7788 rebranded RCA

 

Tested on Amplitrex

Vplate=150V

Vscreen=150V

Vgrid=-1.6V

Good NOS Ma range 38-50ma

Good Gm range 40,000 - 50,000

 

(Frame-Grid 10,000-hour low-noise Pentode, Filament=6.3V @ 340ma)

- Allnic H-3000 phono
- Allnic L-1500 linestage
- Allnic L-3000

See more: vacuum tube
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