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Old 22nd Jan 2022, 6:22 pm   #2
Join Date: Aug 2007
Location: Walsall Wood, Aldridge, Walsall, UK.
Posts: 2,245
Default Re: Best 100MHz analogue oscilloscope?


If you're happy with an ordinary plain vanilla analogue one, why not get another 465 or 465B ?

Admittedly the internal access and repair is grotesque, but there's tons of spares and I'm sure other members'll be able to come up with spare bits!

(I appreciate it's a bit morbid to say so, but they do come up from time to time very cheaply, often when an amateur or hobbyist with one unfortunately passes on, these often go a lot cheaper than the silly overpriced offerings by T & M or commercial vendors! That's how I got many of my cheapie ones in my collection!)

Performance wise, the triggering on the 465/465B is excellent, they have a very bright, (altho' not the finest of traces as they use an expansion–mask CRT), most of the circuitry is well known, understood and reliable!

Items likely to need replacement are:–

a) Power Supply Electrolytics on Main Board A4, special little Adapter PCBs are now offered by various sellers to allow the fitting of standard 10 mm pitch PCB electrolytics without making a mess of the original PCB;

b) Attenuator leaf switches need cleaning, the procedure has been documented on here a number of places;

c) Overloading the inputs can damage the little plug–in DIL format attenuator modules, but these are used in a number of Tek 400 series and 7000 series scopes, I believe members can supply a few spares!

The 465B is the better of the two as this meets the 100 MHz bandwidth easily with a bit to spare, the earlier 465 doesn't always do so!

Chris Williams
It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!

Last edited by Chris55000; 22nd Jan 2022 at 6:35 pm.
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