On 2012 Jan 31, at 7:14 PM, Ian King wrote:
I have a 561A that makes me happy. :-) I do need to clean its
switches,
though. FWIW, I'd love to find a 3A74 plug-in for it. There's enough
stuff that I do with vintage machines, requiring not screaming hot
bandwidth but multiple inputs, that the 3A74 would just be far too
cool
for words. Just sayin'
There is a 4-channel plug-in (presumably a 3A74) in one of the 500
series Tek scopes at the radio museum here. Not sure which 5xx base
it is in. I'd love to be working on it.
The 560 seires takes totally different plug-ins from the other 500s...
Basically, tjhe 530//540/550 series take 'letter series' (like 'type M')
and '1 series' (like '1A1') plug-ins
The 560 series take 3-series and 2-series (the latter being the timebases
IIRC) plugins. These 'scope mainframes contain almost no electronics
apart from the PSU, I think the plug-ins drive the CRT plates directly.
The 580 series take 80 series plug-ins, or letter series/1 series with
the Tpye 81 adapter.
A 4 trace plug-in fro a 530/540/550 could be a Type M or a 1A4.
-tony