This is one of the first real portable Teks. The 3 series was more transportable then portable. It is introduces in 1966 with the small display and nuvistors. This one has pcb’s dated 1965. So a very early model. Latere 453’s have a bigger screen and colors on the front panels to group functions. Like the 7000 plugins. The calibrator and channel 1 output is here at the side of the scope, on later models that moved to the front. Like the 5XX series there is a small amount of silver solder mounted in the scope for repair. It is behind the fan panel.
It has a 50 MHz bandwidth and a Tr of 7 ns. On the picture it is showing a 6,7 MHz , 1 ns pulse . The Tr measured is around 7 ns so it is within specs.
In 1971, with the 453A, they replaced the nuvistors by fets. It has a delayed timebase. I miss the special mains connector and the dust cover. For the rest it is in very good shape.
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