(!!!!) (Best Pair) D3a=7721 Siemens Germany NOS 1978 (32.5/33ma) 1% matched
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1 matched pair) D3a=7721 Siemens Germany NOS 1978 printed in 1980
1 tube) 32.5ma Gm=36,000
1 tube) 33.0ma Gm=36,000
Matched on Amplitrex
Vplate=190V
Vscreen=160V
Vgrid=-1.2V
Good NOS Ma = 22-30ma
Good NOS Gm = 33,000-35,000
See more: vacuum tube
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 (Best Pair) D3a=7721 Siemens Germany NOS 1978 (32.5/33ma) 1% matched "Pin It")