Hi Rob, Marlin. This set has channel 1 but with the later chassis. I had a similar problem with Sam's that my Sam's was for the octal tube set. Fortunantly I didn't run into any problems where I needed a correct schematic. Grubby as this set was the chassis would produce a raster as it was.
I have two of the wood cased models too, a 505 and a 506? in bad need of restoring also (all with the later chassis) I had a set of brown knobs made at the same time as the black ones for the T-54 wish I could have some 7JP4s made
