[tubesrule]

The Television series of books can be a decent reference but the articles are taken mostly from RCA Review and are usually "after the fact" of the event as RCA was not one to publish current work in progress.

The RR-359A at the ETF hds been extensively modified after if left RCA and can't be used as a reference for the initial state of these sets. My RR-359A1 and the other RR-359A in a private collection are both 2.25MHz carrier spacing. Television II does mention this.

These sets went through a whirlwind of changes and while I have much of the documentation, there are many things unknown as to when the change actually occurred. For examples: The sets all original had continuous tuners, 7 controls under the lid and a metal crt shield. The 359B's are mixture of continuous/detent tuners, 7 vs 3 controls (the other 4 were rotated down under the deck board), and metal vs the cardboard sleeve later used on the TRK12 which also required a change to the deck board. While all these changes were made to the later B's, I have found no documentation as to when the change over for each occurred.

One RR-359B was modified to be used as the Master Receiver at the 1939 Worlds Fair. Since the LO leakage was terrible from pre-war sets, they could not operate the rows of TRK-12's and RR359B's in the pavilion using RF. This RR-359B was modified with line outputs (a cathode follower for video and an extra audio amplifier) which then fed the display TRK-12's and RR-359B's modified with line input amplifiers. This set has the "regular" RR-359B IF's and the original schematic, while showing the line output modifications, does not show any IF changes. This set works properly on a VSB signal.

(for some reason I can't upload files today, the above reference is in Television II page 35)