12-28-2009, 12:19 AM
Status Update:
I dismantled the clock, cleaned off the old grease and oil and reassembled it. The rotor was a bit to noisy for me. I can only think of little gears grinding and rattling away to keep time. I used an abrasive circular cutter with a Dremel tool to slice a small gap on the top of the rotor so I could inject a teaspoon of Marvel Mystery Oil. I sealed the rotor by hammering a small piece of lead (I could have used solder)into the gap. After smoothing over with a fine hobby file, I finished it off with a tiny duct tape patch. The clock runs silent except for a small 60 cycle hum I can hear with my ear on the case. No more rattles or grinding sounds.
The radio does have a music alarm. The radio comes on 7 to 10 minutes before the alarm buzzes. I had to fabricate a C-shaped missing part from 0.012" brass to make it work. This part is attached to one end of a lever arm that rides on a slotted disk that turns with the hour hand. The disk hold the lever up which in turn keeps the contact for the radio open. When the arm drops in the slot, the contact can close. A few minutes later, the buzzer is triggered much the same way.
The radio is an AC/DC type, which sort of scares me. I replaced all of the paper capacitors and the three electrolytics. I also need a new 2200 ohm power resistor and a replacement for the 22pF antenna cap that's shorted. The audio section of the radio works but I think the diode may be bad. All of the voltage reading from the circuit common are off. They should be around zero but they are 30 to 40 volt range. I've also tried applying a signal at the grid and the volume next to nothing. I can't decide if I should simply get a new diode (12SQ7) do more testing after my missing and bad components are replaced.
Dang thing with a floating ground is tricky to work with but I haven't been shocked yet. That hot chassis has me worried.
The Telechron clock radio 8H59 Musalarm is idential. A schematic and service notes for the clock and radio are available at Nostalgia Air. Interesting that the instructions on how to rewire the 2200 ohm filter resistor when using the radio is fitted with a center tapped transformer. I've stayed with the notes for the GE model that Gary gave me.
I dismantled the clock, cleaned off the old grease and oil and reassembled it. The rotor was a bit to noisy for me. I can only think of little gears grinding and rattling away to keep time. I used an abrasive circular cutter with a Dremel tool to slice a small gap on the top of the rotor so I could inject a teaspoon of Marvel Mystery Oil. I sealed the rotor by hammering a small piece of lead (I could have used solder)into the gap. After smoothing over with a fine hobby file, I finished it off with a tiny duct tape patch. The clock runs silent except for a small 60 cycle hum I can hear with my ear on the case. No more rattles or grinding sounds.
The radio does have a music alarm. The radio comes on 7 to 10 minutes before the alarm buzzes. I had to fabricate a C-shaped missing part from 0.012" brass to make it work. This part is attached to one end of a lever arm that rides on a slotted disk that turns with the hour hand. The disk hold the lever up which in turn keeps the contact for the radio open. When the arm drops in the slot, the contact can close. A few minutes later, the buzzer is triggered much the same way.
The radio is an AC/DC type, which sort of scares me. I replaced all of the paper capacitors and the three electrolytics. I also need a new 2200 ohm power resistor and a replacement for the 22pF antenna cap that's shorted. The audio section of the radio works but I think the diode may be bad. All of the voltage reading from the circuit common are off. They should be around zero but they are 30 to 40 volt range. I've also tried applying a signal at the grid and the volume next to nothing. I can't decide if I should simply get a new diode (12SQ7) do more testing after my missing and bad components are replaced.
Dang thing with a floating ground is tricky to work with but I haven't been shocked yet. That hot chassis has me worried.
The Telechron clock radio 8H59 Musalarm is idential. A schematic and service notes for the clock and radio are available at Nostalgia Air. Interesting that the instructions on how to rewire the 2200 ohm filter resistor when using the radio is fitted with a center tapped transformer. I've stayed with the notes for the GE model that Gary gave me.
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