Historical Measurement Equipment

PM3253

24

1970

A Philips PM3250 series oscilloscope with X*Y multiplication and analog storage features. These features are denoted by incrementing the part number by one and two respectively. This is why this model is known as the PM3253. Made in the early 1970's this was a very capable oscilloscope offering a 50Mhz input bandwidth and two individual time bases. As was typical for the era, these models are entirely build using discrete transistors each and every one on their own tiny standoff post.

Known to power up but shows several defects. Primarily in the maximum deflection achieved on the CRT which is typically about half the surface area. Power cycling the device is known to some times boot it into a fully working state. Adjusting the input and x position indicates the failure might be due to amplification in the HV section. These amplifier typically use totem pole AB amplifier configurations.

2021