Tektronix Type B Plug-In Instruction Manual page 9

Circuit Description — Type B
Output Cathode Followers
Output cathode followers are used to drive the capaci­
tance o f the interconnecting plug and main-amplifier input
circuit. The cathode follower circuit is modified by resistors
in the plate circuits and by capacitors cross-connected from
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the plates to the opposite cathodes. This modification im­
proves the high-frequency balance of the plug-in unit.
The H.F. PEAKING control, R3872 (S/N 3301-up) varies the
current in the cathode followers. This changes the imped­
ance at the cathodes and changes the effect of the series
peaking coils, L3842 and L3942 (L4512 and L4562 S /N 101-
3300), tied to these cathodes.