I tried again. Since the CRT is completely covered I cannot see any
filament working.
Shortly before the tube's diameter gets wider some connectors for
deflection I guess. Even there some color avoid having a look onto any
filament.
Is it really colour or might it be dirt ?
The tube is such long you can't have a look from the back unless you
remove the backcover. But I would like to avoid as much disassembling as
possible unless it worked once. Then any other cleaning will happen and
I try to "renovate" the item.
I'll try to get a high voltage adapter for my Gossen multimeter. Then
I'll check the -1350V and the 8960V.
br,
Michael
m38a1_1962 said the following on 05.02.2007 03:35:
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Before you go too far with the chassis cleaning and wholesale tube
testing, check and repair the low voltage power supplies first (be
especially wary of the bypass capacitors across the precision voltage
divider resistors). If the voltages are all in tolerance, look at the
high voltage rectifier tubes under the top HV cover to see if their
filaments are glowing. This will tell you if the HV oscillator is
working. If they are glowing, the CRT filament should also be glowing.
You won't be able to fix anything else until the power supplies are
working. BAMA has a 535_545 manual listed for free download if you are
in for some troubleshooting. Good luck.
--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com>,
Artek Media <manuals@...> wrote:
Michael
For starters , do a search in the Tekscopes archives for a a long
email thread on washing and baking old scopes to get the grime out .
It may be as far back as two years ago but there was a lot of
discussion.
Next I would carefully remove and mark the locations of all the
tubes, find a friend with a tube tester and test all the tubes ...
Once you have a clean dry scope and a good set of tubes time to start
tracing the circuits for bad electrolytic.. Many will suggest that
you just replace them all :-)
Does the filament on the CRT glow ? If that is dead ...you may be out
of business till you find a doaner scope
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