My "New" CT-100 restoration

[dtvmcdonald]

Its back here, for a few more technical notes.

While it worked, it became obvious that the CRT cathodes were
at too-high a voltage, requiring too much drive (contrast). This was
eventually traced to the 1.8K resistor in the CRT divider chain, which
was 18K when cold, lower when warm. I happen to have an
5W replacement part.

Also, the purity pot (20 ohms) in the B+ cage is bad. It probably
will work OK as its only broken near one end. I ordered a replacement
(25 ohm at 12.5 watts) from Mouser, but would like to find an
exact replacement. Where does one find such a thing?