This Pearce Simpson Sentry radio was forced upon me by the guy that sold me the Executive CTZ-100D. He literally chased me down on my way to my vehicle to say it came with the other radio. Well I think he just wanted to get away from from his tailgate sale so his lovely wife took over the selling and he got a legitimate reason to wander around and shop for himself
It looked like any other old '60s transistor CB at first. I was surprised to find it is indeed a tube hybrid. Evidently right on the solid state/ tube changeover timeline as there are tubes in the PA section and transistors in the receiver section. In fact several transistors are in sockets, like Nuvistar tubes. Freaky.
I've yet to find a schematic for the Sentry but it may be similar to other Pearce Simpson models?
Transistors/ FETs in sockets. An idea that didn't stick around long
You have to consider the time period. Tubes were still in vogue and transistors were not all that reliable or have a long service track record yet. So since tubes were in sockets for easy replacement, it stood to reason to offer the same servicing convenience for transistors. Eventually, when transistors became more reliable, and didn't weaken with age like tubes, they decided to save a few pennies by removing the sockets.
Bringing yesterday's CB radio fun into the 21st century.
If you're in the SE-PA area, join us Wednesday nights on Ch 13 for "Classic Radio Roundup", where you can hear a bunch of yesterday's radios strut their stuff in fine style.