Then there is the other trick of powering-on, if safe to do so, and turning
out the room lights for a few seconds. (Stand back)
This should show any arcing or flashovers in the HV compartment. Sometimes
a smell of Ozone,
I once did this with a 536, and one of the HV rectifier tubes was lit up
like a blue Neon sign.
Usual warnings apply: HV = High Vigilance !!
Tim
toggle quoted message
Show quoted text
On Tue, 20 Jul 2021 at 05:13, Jeff Dutky <jeff.dutky@...> wrote:
Ren¨¦e and Harvey,
The scope still has it's emergency spool of silver solder, apparently
unused, but I also bought three 0.35 oz coils of Kester 62/36/2 silver
solder when I was working on the 475 or 475A HV sections a few months ago.
When you say "high heat" Ren¨¦e, what temperature are we talking about? I
already replaced one blown resistor in the LV section, and I used my old
Weller iron (the kind with the magnetic tips that you have to change to
select the temperature). It was not easy to do, but I think some of that
was because I did not clean the area very well before applying the heat. I
also have a surface mount rework station with a soldering iron attached,
and it allows me to adjust the temperature with a dial. What temperature
should I be using on the ceramic strips?
I'm was already planning to test all the electrolytic cans, so testing the
axial leaded caps is only a little more work. I'm glad that mylar caps will
do as replacements, as I already happen to have a good supply of those that
I have been using on some EICO instruments.
-- Jeff Dutky
