[mikethedruid]

I have finished working on my Socket Power unit. I found that the proper light bulb to use to get the 135+ volts for the audio output stage is 14 watts. I bought several different bulbs from Bulbs.com, 7 1/2 watt, 14 watt, 15 watt, and 25 watt. Kept trying until I hit the right one. 15 watt was about 145V out, and 7 1/2 watt was only about 100V, but fortunately I had bought the 14 watt bulb which worked perfectly. I also had to replace the resistor between the amplifier +B supply which is supposed to be set at 90 volts for my Freed Eismann Model 50, and the detector B+ which is supposed to be 22 1/2 volts for the UX001A detector tube. Now all the voltages are correct. I made a test jig so these tests could be done under approximately the correct load using a terminal strip and 3 resistors. I calculated the values of the resistors based on the amount of current that they would drop at the correct voltage, figuring for the 00A only on the detector, 5 01A's TRF stages and first 2 audio stages on the 90V+ output, and the 71A output the only one drawing on the 135V. Everything seems to work fine. I looked to check for ripple with my scope and there was nothing noticeable. They must have really calculated this one well, Now I'm working on a Magnavox Telemegaphone speaker to use with the radio. Once that is done I'll put together the C batteries for the radio, easy enough using 3 C cells each for the 2 4 1/2 volt C batteries. I look forward to trying this radio out. I bought it more than 50 years ago, when I was about 13. It cost me $20, which was a lot of money for me back then. It was the most I had ever paid for an old radio. Usually it was no more than $5, and often my neighbors would give them to me free, or I'd find them being thrown out. Back then I built a B supply for it and had it working with an RCA speaker I usually use with my Atwater Kent Model 40. I would like to get it working again.