1A4: Difference between revisions

1A4 (view source)

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Kurt

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	The signal path of each channel of the 1A4 is as follows. First the signal passes through the attenuators. Then it is clamped by two diodes and applied the the gate of a JFET source follower. The source of the source follower is the trigger pickoff point. From there the vertical signal path goes through an NPN emitter follower followed by an NPN differential amplifier, at which point the signal becomes differential. Next, the signal passes through an analog multiplexer made with 1N4152 silicon switching diodes. After the multiplexer network, the signal passes through a common base amplifier followed by 6DJ8 tube operating in common grid configuration.		The signal path of each channel of the 1A4 is as follows. First the signal passes through the attenuators. Then it is clamped by two diodes and applied the the gate of a JFET source follower. The source of the source follower is the trigger pickoff point. From there the vertical signal path goes through an NPN emitter follower followed by an NPN differential amplifier, at which point the signal becomes differential. Next, the signal passes through an analog multiplexer made with 1N4152 silicon switching diodes. After the multiplexer network, the signal passes through a common base amplifier followed by 6DJ8 tube operating in common grid configuration.

			* [http://bama.edebris.com/manuals/tek/1a4 1A4 manual on BAMA]