Hi I got very lucky and found an old 1948 4 tube AM radio, a Rogers Majestic R109. Hardly anyone has old stuff around here it seems. It can be plugged in or run off 3 batteries. It weighs about 4.8lb/2.2kg, without batteries I guess. Its 4 x 7.5 x 5 inch / 102 x 191 x 127 mm
http://www.radiomuseum.org/r/rogerstube_r109.htmlI even found the schematic pdf
http://elektrotanya.com/rogers_majestic_r109_sm.pdf/download.htmlI'll add my images at the bottom NO I CAN'T THEY ARE ALL OVER 2MB, so how do I post pictures ?
Its pretty clean inside, no signs of prior entry. The tubes don't even seem to glow at all, I'll have to turn off lights. But after 5-10 minutes they weren't even hot, so wow
. 3 of them use 1V heaters, and the audio amp tube uses a 3V heater, so thats why.
The cord was cut through in places so I finally spliced on another 1 and fired it up. And it only partially works......WHICH IS GREAT because now I get to poke around and get it working better and better. I've barely spent 5 minutes probing around, just looking for places not to touch and get zapped really.
It has what seems to be 60Hz hum thats always at what I guess is the maximum volume, regardless of what the volume knob is set to.
The antenna is built into the flip open lid, that hides the volume and tuner knobs, and releases a spring loaded on/off switch. The switch is only pushed down or let free to be on, there's no latching it seems, thats annoying.
At 1st I wasn't getting any radio at all, but if I touch the spring/hinge of the flip cover (which contains the loop antenna) , I do get CBC 640AM here in St.John's, Newfoundland, Canada. Just by fluke I had the knob set right there somehow.
It comes through pretty distorted, and mixed with that persistent full volume 60Hz hum, but I can make out the words.
When the radio is out of the full metal case, the top lid w/antenna just attaches with 2 plugs for either end of the antenna. Moving that lid around makes the thing go
completely silent, and jiggle it a bit more and the sound comes back. But its not turning it off, because when its turned off/on, the volumes starts a bit low then ramps up over 1-2 seconds as the tubes get going. When it comes back from going silent, it just comes back in an instant. Not sure what thats about yet, shorting something, never checked voltages during that yet.
So there's about +8 paper/waxed capacitors that I'll replace 1 at a time in order by the schematic, to see what changes. And 2 big multi-capacitor cans I believe. No doubt they should go too. They are in cardboard tubes, I'll try and save them for the retro look.
There's one of those sand covered resistors I know nothing about yet, its leads are pretty corroded and I've knocked sand of it cause I didn't even know what it was a few months ago.
1 Tube seems to have some residue build up inside, I'm new to this and can't remember what all those repair videos say that is. But they work, how well who knows. Same for the variable inductor cans, and whatever else is built into them.
There's 1 component with 120VAC (I think, writing this before going to work) across it, no idea what it is, its picture 2-4. Maybe cooling fins over something. I've barely looked at this radio yet, but I've had it for months.
So I have a fun project to work on and I even tracked down the SCHEMATIC. So I'll learn a bunch along the way. Just wish I had more stuff like this to play with.