442
The Tektronix 442 is a 35MHz dual-trace oscilloscope with a single timebase.
Serials numbers from B010100 to B010786 use the 154-0729-00 CRT. Starting with serial number B010787, the 154-0804-00 CRT is used.
Triggering is done using a trigger amplifier made of discrete bipolar transistors and a 74S00 TTL quad NAND gate configured as a flip-flop.