When you read the American radio schematic diagrams from 1940s and 1950s ... GANGED Rotary Switches were very common.
The Band/Frequency rotary switch being the most complicated.A rotary switch is a midcontact switch part of the schematic with the contacts arranged in a full or partial circle. Instead of a pushbutton or toggle, the mechanism used to select the contact moves in a circular motion and must be turned.
ROTARY SWITCHES are specified by POLE (P) and THROW (T)
The Ceramic or Phenolic WAFERS -- MAY have 2 separate switch mechanisms on one wafer.
The SUFFIX on the Switch Number, such as S1A
, would refer to Wafer "A";
, would refer to Wafer "B";
CORROSION, DIRT, and WEAR are common issues with these switches after 60 years.Spray contact cleaners are POOR approaches for these switch mechanisms. Too much cleaning fluid CAN cause issues with early phenolic wafers (expand), that result in more problems.
Dental picks, Q-Tips, foam VCR head cleaning swabs work best,
wetted with Caig DeOxit or equivalent solvent.
Takafumi Ueno (Japan) Restoration of SX-99http://www.w9wze.net/Restorations/SX99/SX99restoreUeno.html
W5KCM Restoration Photoshttp://www.flickr.com/photos/wb5kcm/sets/72157605484479311/
Regarding your IF CAN (coil) questions, I will have to pull up the schematic Picture is worth hundreds of words ....