Motorola C11G dirty as heck but sweet!
Found blue Motorola C11G clock radio that looked like it was buried in a dust bin for 50 years. It smelled like lint, dirt, and mildew. But, the amazing thing was no cracks and the clock worked as soon as I plugged it in. The radio didn't work though.
Look at all the calcification around the filter capacitor. That's many many years in a damp basement. Needs to be removed and replaced.
Here's how it sounded
Here's that yucky filter capacitor:
That clock movement will need some rust dissolver. Good thing the movement is sealed.
Here's that filter capacitor removed:
Care not to break the circuit trace lines:
Here's new installed filter capacitors. It needed two 47uF capacitors and one 30 uF capacitor. I use Rubycon 400V for the two 47uF and Panasonic 250V for the 30uF. I avoid Chinese brands for these filter capacitors because they tend to dry out and perform poorly under different conditions.
The three discrete filter capacitors as opposed to the original 3-in-1 combined capacitor is the same functionally. But electronically, the ground of the 3-in-1 original filter capacitor acts as part of the circuit by connecting the three grounds.
Here's with the three capacitors installed:
Here's what is looks like after everything is cleaned up and put back together. Sounds great and keeps accurate time!
Here's what it sounds like after new capacitors installed.
1. This clock radio needed a new tuning string.
2. The tuning disk fell off and need to be reinstalled and tightened.
3. All the rust on the clock mechanism needed to be removed.
4. The cabinet needed extensive cleaning
5. Needed a few tubes replaced.
6. Needed some solder re-flow around tuning capacitor
7. Needed new antenna wires
Here's what it looks like now:
Nice cove design in a rare color. The only blemish is some of the clock and front control metal faschia has oxidation trace lines.
Here's what it sounds like now.