Sam Goldwasser wrote in
:

Jim Yanik writes:

The first TEK scope I built from old boards was a 5 Mhz 221
mini-scope,but it had problems in the 4 layer PCBs,I had to jumper
too many runs,so I traded it for boards for my 2213. It's CRT was too
small for much use,anyways.

What's the next model, the 321?

An entirely different class.
The 200 series were a group of handheld,battery-powered scopes with really
small CRTs.

The 300 series (after the 321) were from Sony-TEK.
The 321 was first sold in 1960,BTW.It was TEK's first solid-state scope(and
also battery-powered).
The 211,the first 200 series scope,came into being in 1972.

I still have one of those that more
or less works (or at least it did the last time I tried it a couple
years ago). Some of the design of that is strange. I have to power
cycle mine a few times before the trace appears, and only at full
brightness. I think I concluded it was fault in the CRT because
everything else checked out.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
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--
Jim Yanik
jyanik
at
kua.net