Quote:
Originally Posted by zeno
Actually Zenith used its first IC in the 69 model year (1968) for
color demodulation. Also added AFT that year. One of those long legged
metal case OP amp styles. Plugged into a tube socket. IIRC youurs
uses a DIP IC & plugs into a socket with hand wiring provision.
Zeno  |
+1
In 1971 some of the consoles got a duramodule with a dip IC. And in 72 some of the consoles with the round IC that plugged into a standard tube socket switched from that to a chassis socketed DIP IC (that's the only difference I noticed between the 20BC50 and 20CC50 chassis). It seemed in the hybrid era Zenith fielded more different color chassis both console and portable than they did before and each was slightly different how it was a hybrid....My guess is that Zenith was afraid that they'd get a bad batch of parts, or someone would make a bad circuit and that if they didn't have that technological variety their whole brand would suffer instead of only a small portion of their line.