544
The Type 544 is a 50MHz scope introduced in 1964. It has with one timebase.
The 544 (at least the early ones) uses the same tunnel diode triggering circuit as is used in early 547 (tunnel diode in the collector load of a PNP differential amplifier).
A factory modification, MOD 108G, was available that increased the accelerating voltage to 24kv. The 1968 catalog lists an RM544 Mod 720 which has a direct-access plug-in and has 1ns risetime.
The vertical amplifier and low voltage power supply of the 544 are the same as those of the 546 and 547. The 544 uses the 154-0478-00 CRT.
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544 front view
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RM544 front view
