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The Type 59 plug-in contains two tubes, total.
The Type 59 plug-in contains two tubes, total.
Both are [[6B8A]] pentode/triodes.
Both are [[6BA8]] pentode/triodes.
A triode cathode-follower buffers the input.
A triode cathode-follower buffers the input.
Next is a differential amplifier made of two pentodes.
Next is a differential amplifier made of two pentodes.