[Pete Deksnis]

Phil, Ed thought of the K-1 as a close clone of the RCA Model 4. So close in fact that he felt the image on a K-1 would give the viewer accurate insight as to what an operable Model 4 would display.


First, there are differences between the two designs, although examples such as these affect the bottom line more than the picture:

For its power supply, a Model 4 used two selenium rectifiers in a voltage-doubler circuit as did the Model 5 and CT-100. The K-1 uses four 5U4's.

The Models 4 and 5 used a 6CD6 to drive their horizontal output transformers while the K-1 used a parallel-connected pair of 6CD6's.


There are many similarities between the two designs, for example:

The Model 4 and K-1 use a Chroma Phase Amp stage and a pot for Hue adjustment rather than the much simpler variable cap and inductor hanging on the burst amp grid -- that first appeared on the Model 5.

The R, G and B video amplifiers on the Model 4 and K-1 were identical, but then were cleaned up and simplified somewhat for the Model 5.


And yes, There is a K-1 Photofact, the Set 265 Folder 13 dated Feburary 1955.

Pete