Description
(!!!!) (Holland single 1958) ECC83=12AX7 Triotron Holland “long plates” with “D” getter halo like new 1957 (1.1/1.2ma and Gm=1700/1700)
1 low noise tube) ECC83=12AX7 Triotron Holland “long plates” with “D” getter halo like new (mC5-delta7A) = 1957 – copper grid posts – in white box
1 section) Gm=1700 (1.1ma)
1 section) Gm=1700 (1.2ma)
NOS Gm = 1500-1600+
NOS mA = 1ma+
– best sounding 12AX7
– lively midrange