1947 SCOTT 800B Radio Console Part 2 of 20 Re-cap of Amp Chassis
1947 SCOTT 800B Radio Console Part 2 of 20 Re-cap of Amp Chassis
I finally get started on the amplifier & FM IF chassis. It’s a more complex chassis than it looks like, at first. A couple of minor hurdles, but I’m well on my way to taming this beast!
Hey Michael, Looks like it’s coming along well. Grandaddy had a "B" Farmall with the seat off to the right side of the back of the hood. On our farm growing up we had two little tractors. A 39′ John-Deere "A" and a ’41 John-Deere "H", all good little tractors. I know the old "A" is still running. We restored it back in the late 80’s and our next door neighbor from back then owns it now. The H wound up with another neighbor, but he sold it off and he’s long since passed on himself. Grandaddy’s "B" wound up with my Uncle James McClain for a while, but I don’t know what he ever did with his. Someday I want to get out to our old neighbors and film our old "A", maybe do a hand crank start of it. Take care, Gary
Pcb’s oil most likely. Not good, carcinogenic, you shouldn’t open those up.
Those canned condensers are filled with a non-conductive oil. As long as they remain sealed, the chances are that the condensers inside them are going to be, and remain, just fine. This is one of the few times that it is best just to replace the electrolytics, and leave the canned paper condensers alone. If any prove to be problematic, THEN replace them, but the chances are they will be just fine. I just refurbished a Scott SLRM marine radio, just slightly earlier than the 800B. It was made during WW2 for use on merchant ships, and specially designed so that they would not emit any RF from the local oscillator which the U Boats could detect and home in on. It is full of those same kind of oil filled "bathtub condensers". The only one I did replace was on the line input. The SLRM has no power transformer, but runs directly off the mains either AC or DC. I did replace the two "dead man" condensers that were in a single can and used across the power input from each side to chassis ground with modern Y type safety caps on a 3 terminal strip. When I tested the condensers in the can they were EXACTLY on spec to within less than 1% ! Other Scott experts told me to leave the rest alone as they almost never go wrong. They were right. The radio plays BEAUTIFULLY, and is extremely sensitive and selective. I didn’t even have to do an alignment! This is remarkable since there WERE signs of use, several of the original JAN type tubes had been replaced with civilian tubes, but otherwise the radio was completely virgin. It even has the original wooden handled alignment tool and the hex wrench for removing the knobs still in place!