02-05-2012, 05:23 PM
Hey guys,
Proceeding with reviving the Jr.
Washed the tuning cap in dishwashing liquid - sparks like it has just come off the assembly line.![Icon_smile Icon_smile](https://philcoradio.com/phorum/images/smilies/icon_smile.gif)
Now, the two electrolythic caps need to be replaced.
Actually, one cap measures about 8uF (yeah....I know....have to still replace it, too old) and another, exact same cap, measures at 16nF (dried up).
Here's the question #1:
In the sch I can see that the first cap, right off the rectifier, is 8uF, and the second one (after the speaker coil acting as a choke filter...wow! They really saved money on this one!) is 4uF.
Now the caps that are actually in the chassis are 16uF.
Q: should I leave them at the same value, 16uF, or follow the sch?
Question #2:
Directly from the Cathode of the First detector (detector-oscillator) there is a wire that ends nowhere and is wrapped around the central contact of the volume regulating potmeter. I first thought it was a broken wire, but them from the sch I saw all connections are intact, and this wire is just there.
I think it is a small improvised capacitor, of a few picofarads.
Does anyone have the same thing in their Philco 80s? What's the purpose of this "capacitor"? (I think they found out they needed a small cap, and it was cheaper to do it this way than to put in a mica one; this was supposed to be the "el cheapo" of them all).
Proceeding with reviving the Jr.
Washed the tuning cap in dishwashing liquid - sparks like it has just come off the assembly line.
![Icon_smile Icon_smile](https://philcoradio.com/phorum/images/smilies/icon_smile.gif)
Now, the two electrolythic caps need to be replaced.
Actually, one cap measures about 8uF (yeah....I know....have to still replace it, too old) and another, exact same cap, measures at 16nF (dried up).
Here's the question #1:
In the sch I can see that the first cap, right off the rectifier, is 8uF, and the second one (after the speaker coil acting as a choke filter...wow! They really saved money on this one!) is 4uF.
Now the caps that are actually in the chassis are 16uF.
Q: should I leave them at the same value, 16uF, or follow the sch?
Question #2:
Directly from the Cathode of the First detector (detector-oscillator) there is a wire that ends nowhere and is wrapped around the central contact of the volume regulating potmeter. I first thought it was a broken wire, but them from the sch I saw all connections are intact, and this wire is just there.
I think it is a small improvised capacitor, of a few picofarads.
Does anyone have the same thing in their Philco 80s? What's the purpose of this "capacitor"? (I think they found out they needed a small cap, and it was cheaper to do it this way than to put in a mica one; this was supposed to be the "el cheapo" of them all).
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.