Wartime miniscope , miniature oscilloscope

[N_Cook]

I've now added a preliminary schematic to the file, a number of the controls
and inputs/outputs are not included.
http://home.graffiti.net/diverse:graffiti.net/miniscope.htm
some other projects to complete before returning to restoring this 'scope

 

[Ken]

I've now added a preliminary schematic to the file, a number of the controls
and inputs/outputs are not included.
http://home.graffiti.net/diverse:graffiti.net/miniscope.htm
some other projects to complete before returning to restoring this 'scope

Why is there a pot stuck sideways there in the fourth shot, a
troubleshooting aid? Ken

 

[N_Cook]

Why is there a pot stuck sideways there in the fourth shot, a
troubleshooting aid? Ken

That is one of the things a previous owner had done probably in 60s or 70s .
He probably added the 2 Si diodes then.
The genuine pots are very small and the one that should be there is missing
replaced with that one , presumably the smallest he could find but too large
to fit in place. He must have given up when the carrying strap broke and CRT
cracked.

 

[N_Cook]

Why is there a pot stuck sideways there in the fourth shot, a
troubleshooting aid? Ken

Error. The original is still in place but has a broken tag, but enough
remains to measure resistance. The Al cased one is wired in , instead but is
too big to replace the original.