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The Tektronix 453 is a portable 50MHz dual-trace oscilloscope from the mid-1960's to the mid-1970's. Initial versions had nuvistor tubes in the front end as cathode-follower voltage buffers. Later versions used FETs for the same purpose. The vertical amplifier that drives the CRT deflection plates is a cascoded differential amplifier made of NPN transistors. Triggering is by tunnel diode, with a trigger preamplifier preceding that actual trigger circuit. The 453 was almost entirely solid-state even in its first version. The only tubes other than the CRT are the 5642 HV rectifiers and a few 8393 nuvistor triode tubes. | The Tektronix 453 is a portable 50MHz dual-trace oscilloscope from the mid-1960's to the mid-1970's. Initial versions had nuvistor tubes in the front end as cathode-follower voltage buffers. Later versions used FETs for the same purpose. The vertical amplifier that drives the CRT deflection plates is a cascoded differential amplifier made of NPN transistors. Triggering is by tunnel diode, with a trigger preamplifier preceding that actual trigger circuit. The 453 was almost entirely solid-state even in its first version. The only tubes other than the CRT are the 5642 HV rectifiers and a few 8393 nuvistor triode tubes. Each horizontal deflection plate is driven by a common-emitter amplifier with feedback. The total CRT acceleration is 10kV. The cathode is at -2kV and the PDA/anode voltage is +8kV. A Tektronix 453 consumes 100 watts power and weighs 29 pounds (13.2kg). | ||