11-04-2013, 03:19 AM
Snapped it on the next evening to see what I could hear and it wouldn't pickup anything! Now I know this thing is no vacuum but should hear something! Work on it for about an hour trying to find the problem. Everything looked ok and all of the voltages where what they should be. It was pretty frustrating but I did finally did find the issues. The antenna was disconnected!! Hopefully I'm not the only one that misses the simple.
A good friend of mine services computers and he is nice enough to save the dead power supplies for me. Now doesn't sound like much but I find them to be a little treasure trove of goodies. Most will have some good sized diodes, plastic covered wire in many colors, and some good sized electrolytic capacitors. Parts from one was what I used to build the power supply for this set except for the transformer and adjustable regulator.
I revised the power supply by adding a full wave bridge rectifier to the filament supply. I was using a half wave but thought that the bridge would give me a bit more output voltage. A computer p/s yielded a nice 800v@4A bridge. After incorporating it I didn't get the desired result. Still was getting about 4.8vdc out. I'm getting a little better than a 1 volt drop across the regulator. Now theory sez the with the half wave rectifier I should get about 5.5vdc output to the regulator (6.3vX.9) With the full wave bridge I should have 9vdc output to the regulator(6.3vX1.4). But in real life I still have total output of 4.8vdc out of the regulator. Now that isn't real bad as the tubes are rated @ 5v/250ma each. Can certainly use this supply for other sets that have 1.5 to 5v filament with a twist of a knob. If anyone is interested I'll post a diagram of the revised p/s.
Will post some more pic's but need find to with the memory card.Don't know why they call it that it doesn't help me remember it. Did find a barrier strip.
Terry
A good friend of mine services computers and he is nice enough to save the dead power supplies for me. Now doesn't sound like much but I find them to be a little treasure trove of goodies. Most will have some good sized diodes, plastic covered wire in many colors, and some good sized electrolytic capacitors. Parts from one was what I used to build the power supply for this set except for the transformer and adjustable regulator.
I revised the power supply by adding a full wave bridge rectifier to the filament supply. I was using a half wave but thought that the bridge would give me a bit more output voltage. A computer p/s yielded a nice 800v@4A bridge. After incorporating it I didn't get the desired result. Still was getting about 4.8vdc out. I'm getting a little better than a 1 volt drop across the regulator. Now theory sez the with the half wave rectifier I should get about 5.5vdc output to the regulator (6.3vX.9) With the full wave bridge I should have 9vdc output to the regulator(6.3vX1.4). But in real life I still have total output of 4.8vdc out of the regulator. Now that isn't real bad as the tubes are rated @ 5v/250ma each. Can certainly use this supply for other sets that have 1.5 to 5v filament with a twist of a knob. If anyone is interested I'll post a diagram of the revised p/s.
Will post some more pic's but need find to with the memory card.Don't know why they call it that it doesn't help me remember it. Did find a barrier strip.
Terry
