1951 RCA Console

[old_coot88]

What are the particulars on this direct drive circuit? That's somethin' I never ran across (or maybe did and didn't know it). Just wondering if it could be related to the horz linearity problem that some of this chassis series exhibited. Had one that was a real dog, and had to concede defeat finally (the H nonlinearity).

[dieseljeep]

Originally Posted by old_coot88

What are the particulars on this direct drive circuit? That's somethin' I never ran across (or maybe did and didn't know it). Just wondering if it could be related to the horz linearity problem that some of this chassis series exhibited. Had one that was a real dog, and had to concede defeat finally (the H nonlinearity).

I finally looked up the schematic on it. I was trying to remember the capacitor that was in the 2nd anode circuit as the HV filter. It was a tubular paper type, [email protected]. Strange! I replaced it with a doorknob HV type.

[Kevin Kuehn]

Originally Posted by old_coot88

What are the particulars on this direct drive circuit? That's somethin' I never ran across (or maybe did and didn't know it). Just wondering if it could be related to the horz linearity problem that some of this chassis series exhibited. Had one that was a real dog, and had to concede defeat finally (the H nonlinearity).

Save these if you want because Flickr may not approve of the content. For some reason there is no page 2 but the content seems complete.

[Penthode]

I think what killed the autotransformer design was it's requirement for high impedance horizontal deflection coils. Later designs for 90 and 110 deflection tubes requires higher pulse currents which could only be practically achieved with lower impedance. Hence the output transformer was ultimately required to impedance match.

[old_coot88]

Thanks for the info.

[Dj3928]

Good info. Appreciate it