9 hours ago
Hello All;
I found the CMB41L down in the basement, it is definitely a 1950-51 model, the capacitors have date codes from February and April 1950, and the tubes have patent dates of 34-51 stamped on them. There are two toilet roll style filter caps mounted above the chassis in a metal band, and a date of April 1950, both made in Canada, I may restuff the cardboard tubes since there really isn't anywhere else for the replacements to go other then there, plus they can be seen with the back open anyhow. I also found a 150 ohm sand resistor, 2.5 Watt, just ahead of the selenium rectifier, in typical fashion the ends are turning green so it has to go, the main dropper for the filaments is a nice enameled power resistor, so it's probably fine. The chassis is pretty cramped so it's not surprising that not much work was done to it, they probably used the set until the filter caps crapped out and then put it in a closet after replacing it with a transistor radio.
The hinges for the front door are mounted on some plastic insulators, in a sort of shallow "U" shape, but the plastic appears to be different from the ones used on Bob's set, it's clear plastic, with a bit of a rubbery feel, possibly Tennite II as they have some mold on them. The plastic mounts had a pair of pins that plug into some leads above the chassis to connect the antenna, there does not appear to be a wire connecting the antenna loop to the pins so I think they rely on the hinge springs for that purpose. How you would recreate this would take some thought, maybe some ABS plastic, or nylon, they are about 1-1/4'' long, 1/4'' deep, and maybe 1/8'' thick, with a 3/4'' channel inbetween for the hinge.
Regards
Arran
I found the CMB41L down in the basement, it is definitely a 1950-51 model, the capacitors have date codes from February and April 1950, and the tubes have patent dates of 34-51 stamped on them. There are two toilet roll style filter caps mounted above the chassis in a metal band, and a date of April 1950, both made in Canada, I may restuff the cardboard tubes since there really isn't anywhere else for the replacements to go other then there, plus they can be seen with the back open anyhow. I also found a 150 ohm sand resistor, 2.5 Watt, just ahead of the selenium rectifier, in typical fashion the ends are turning green so it has to go, the main dropper for the filaments is a nice enameled power resistor, so it's probably fine. The chassis is pretty cramped so it's not surprising that not much work was done to it, they probably used the set until the filter caps crapped out and then put it in a closet after replacing it with a transistor radio.
The hinges for the front door are mounted on some plastic insulators, in a sort of shallow "U" shape, but the plastic appears to be different from the ones used on Bob's set, it's clear plastic, with a bit of a rubbery feel, possibly Tennite II as they have some mold on them. The plastic mounts had a pair of pins that plug into some leads above the chassis to connect the antenna, there does not appear to be a wire connecting the antenna loop to the pins so I think they rely on the hinge springs for that purpose. How you would recreate this would take some thought, maybe some ABS plastic, or nylon, they are about 1-1/4'' long, 1/4'' deep, and maybe 1/8'' thick, with a 3/4'' channel inbetween for the hinge.
Regards
Arran
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