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Tektronix
I've got an early 60s Tek RM-15 that I've had since 1980, when an instructor at my college gave it to me. Rack mounted, and the ratings are nothing special, but when my other scopes have let me down, the old TEK has been there to save my butt. It's only rated for 15 Mhz, but the waveforms seem pretty accurate to 25 Mhz, as long as you don't need to measure voltage. Single trace, single time base, but stable as a rock, and the focus is so sharp you could cut yourself on the trace. And like almost all of the Tektronix scopes of the day, it weighs more than my wifes car. Since I got this one, I've had 2 RCA scopes, and a Leader die, and my Sencore just isn't as nice to use. I also have a 100 Mhz Kenwood scope, but when it dies, I'm sure this old boatanchor will still be plugging along.
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