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Old 27th Jan 2022, 9:51 am   #28
dave cox
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Join Date: Jan 2009
Location: Bristol, UK.
Posts: 1,832
Default Re: Best 100MHz analogue oscilloscope?

Tektronix 7603 with 7A18 (for ~75MHz) or 7A26 (for ~100MHz) amplifiers - if you can find one at a LOW price. And you have the room! They made this model for 20+ years so there are a few around. Its also the slowest of the series so prices are not as bad as the others. Avoid the 7A13 diff-amplifiers.

The tubes do not have a super sharp trace but it does have a large screen. Yes, they are absolutely packed with custom silicon but nothing with particular reliability issues. I think the channel switches can be destroyed by hot-plugging (so don't!) and I've had a single failure in a V-out IC. But there are dipped tants on board Not the easiest things to repair, the amplifier / timebase modules can be a disassembly challenge and the 'backplane' is tricky to get at. The PSU is modular, and linear, though it doesn't exactly fall out by itself There is usually a fan, but its not shifting a lot of air.

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