(!!) 13D3 Brimar UK black plates tests like new 1962 (6.8ma/7.2ma) (similar to 12AU7)
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1 tube) 13D3 Brimar UK black plates tests like new 1962 (6.8ma/7.2ma) in white box
similar to 12AU7
1 section) 6.8ma Gm=2400
1 section) 7.2ma Gm=2400
Amplitrex Test Data
Vplate=250V
Vgrid=-4.6V
Good Iplate (ma) = 6ma
Good Gm = 2200-2400
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