Cydrome Leader wrote:
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** Bugger - its a BWD 821

http://bee.mif.pg.gda.pl/ciasteczkow...wd_821_001.pdf

In 34 years of daily use, I have replaced 1 open 22kohm resistor and 1 pull switch mini pot.

but, but but, it's not capable of 3Ghz and sampling. It must be a useless
instrument.

** Very true.....

But I needed a scope for knock down, drag out service work on all kinds of items from
tube amps to 2kW SMPSs to 1kW linear mosfet power amplifiers.
Plus all the small stuff like condensor mics.
Plus I needed to be able to service it myself with readily available spares.
Plus it must have a mu-metal shield on the tube.

I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
Eats the Rigol for breakfast for what I do.

nice. How rare/common is the fancy shielding on a scope?

** Low cost, Asian CRT scopes are unshielded.
Everything else pretty much is.


I don't travel with a scope so it's never been an issue for me.

** Got nothing to do with travelling.

A friend just got his first scope, some sort of mid 1980s Kenwood. He
emailed kenwood in japan and they send a scan of the manual. Sort of
jealous of it in fact.

** Likely has no mag shielding.

Be a real PITA if you locate a mains transformer anywhere near the tube.
Such scopes must be sited well away from the work bench and other items of test gear.

Or else the trace shimmers horribly at 50/60 Hz.
Major scam, IMO.


...... Phil