[Chad Hauris]

Many of the RCA color TV sets such as the CTC-39 and CTC-68 have an adjustment for "normal" or "high" line voltage. To quote RCA, the "HIGH" position is "for areas having a 128 volt AC supply".
I generally put these sets on "high" as it gives a slightly lowered filament voltage for less component stress.

Addionally we worked on a Wurlitzer Jukebox, model 3600 Super Star which had 4 bad output transistors. It had 3 line voltage taps which were like 90-110 v, 110-120v, and 120-130v. It had the tap set on the 90v tap so we switched it to 110-120v. This adjustment was probably provided for the juke when it would be in back-country bars that had really low line voltage. We suspected that the tap having been set to the 90-110v and it operating on the modern 120v ac line caused excess stress on the transistors.