RESTORING A JAPANESE OSCILLOSCOPE
Oscilloscopes have come a long way. Today’s range is much more likely to look like a tablet than an old tube-based instrument. Still, there’s something about looking into a radiant eco-friendly tube, particularly if you’ve done the work to resurrect that old hollow specify device. [NFM] chosen up a Kikusui OP-31C–a vintage Japanese range at a second-hand store. He made a video of his restoration efforts that you can see below.
The range really powered up as well as worked the very first time. Of course, unlike a contemporary scope, the OP-31C has to warm up before it will show up. However, the pots needed cleaning as well as as a precaution, he replaced the old oil as well as electrolytic capacitors.
The huge transformer as well as the coarse-looking single sided circuit card definitely will restore memories if you are old enough. [NFM] had a schematic of the range as well as takes you on a trip of the innards, although his schematic had some subtle differences from the actual unit, potentially because of some repair work work.
He was going to rebuild one of the big electrolytic “can” capacitors to keep the outer shell with newer (and smaller) contemporary capacitors. However, he discovered a extremely similar contemporary capacitor as well as utilized that, instead.
We believe it would have been much more fun if the range didn’t work. However, it was still a excellent tear down of the old tube-based device. This is a bigger gadget than the last old range tear down we looked at. Not that we haven’t seen smaller ones (although, the link in the publish has moved).