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Starting at serial number 1071 (and sometimes retrofitted to earlier instruments), the dual-triode | Starting at serial number 1071 (and sometimes retrofitted to earlier instruments), the dual-triode | ||
Schmitt trigger circuit was replaced by | Schmitt trigger circuit was replaced by an [[STD615]] 10 mA [[tunnel diodes|tunnel diode]] AC-coupled to the | ||
base-emitter junction of an [[OC171]] germanium PNP transistor as a pulse amplifier. | base-emitter junction of an [[OC171]] germanium PNP transistor as a pulse amplifier. | ||