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(!!!!) (#1 D3a Pair 1978) D3a=7721 Siemens Germany NOS 1978 (33/34ma) 1-2% matched

(!!!!) (#1 D3a Pair 1978) D3a=7721 Siemens Germany NOS 1978 (33/34ma) 1-2% matched

$ 139.99

1 matched pair) D3a=7721 Siemens Germany NOS 1978 printed in 1980

1 tube) 33.0ma Gm=41,600

1 tube) 34.0ma Gm=40,500

 

Matched on Amplitrex

Vplate=190V

Vscreen=160V

Vgrid=-1.2V

Good NOS Ma = 22-30ma

Good NOS Gm = 33,000-35,000

 

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