Soldering to the ceramic strips in these scopes is an
art form. It is easy to wreck them. I would suggest
avoiding that and exhausting other methods of checking
soldered in parts.
If you have to do soldering on these strips, you need
a high wattage, temperature controlled iron, Tektronix
used 70W screwdriver tipped irons. Do not put the
iron into the cut in the ceramic. To do so invites
taking a big chip out of the terminal. Heat the wire
with the iron on the side of the strip. Use only 2-3%
silver, tin/lead solder. There should be a small reel
attached to the chassis somewhere... also usually in
the plugins somewhere.
-Chuck Harris
YudaMan3 via Groups.Io wrote:
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Albert and Chuck and anyone else who wants to opine:
1. should I attempt to adjust the -150 with the adjustment pot and see if I can get the 10V change from -160 to -150 before flipping the scope upside down and taking component voltage readings?
2. should I replace C197 just because it's doing a lot of work, has been stressed and is cheap and easy to replace?
3. don't laugh at this question but I've never tested a tube other than in a tube tester ... a LONG time ago. How do I test open filament in V724?
THANK YOU again for your time, answers and suggestions.
