06-20-2015, 02:38 PM
Looking around in my stash o'stuff, I found a 2200 ohm chassis mount resistor. 50 watts, which is overkill, but hey, I have it so I tried it.
Worked like a charm...the radio now picks up my SSTRAN and I can barely hear a few other AM stations with my ear close to the speaker...
As a refresher, here's how the chassis did look:
[Image: http://www.philcoradio.com/images/phorum..._00021.jpg]
and how it looks now:
[Image: http://www.philcoradio.com/images/phorum..._00023.jpg]
[Image: http://www.philcoradio.com/images/phorum..._00024.jpg]
And here is the open choke:
[Image: http://www.philcoradio.com/images/phorum..._00025.jpg]
Unfortunately, we're not out of the woods yet. The volume is very low. Could very well be the missing 1 volt bias cell, although with a 22 megohm resistor in place of the bias cell and the 1 meg resistor, I measure 1.1 volts on the grid of the 75 tube. I even "borrowed" a good 43 from my restored and working 38-14CB, and it didn't make any difference.
And there's still the problem of alignment. I tried isolating the radio from both high and low leads by using two 0.1 uF caps in series with each signal generator lead, but that made the GFCI outlet that protects the basement outlets make a weird buzzing noise, so I quickly disconnected it all.
Any advice welcome...
Worked like a charm...the radio now picks up my SSTRAN and I can barely hear a few other AM stations with my ear close to the speaker...
As a refresher, here's how the chassis did look:
[Image: http://www.philcoradio.com/images/phorum..._00021.jpg]
and how it looks now:
[Image: http://www.philcoradio.com/images/phorum..._00023.jpg]
[Image: http://www.philcoradio.com/images/phorum..._00024.jpg]
And here is the open choke:
[Image: http://www.philcoradio.com/images/phorum..._00025.jpg]
Unfortunately, we're not out of the woods yet. The volume is very low. Could very well be the missing 1 volt bias cell, although with a 22 megohm resistor in place of the bias cell and the 1 meg resistor, I measure 1.1 volts on the grid of the 75 tube. I even "borrowed" a good 43 from my restored and working 38-14CB, and it didn't make any difference.
And there's still the problem of alignment. I tried isolating the radio from both high and low leads by using two 0.1 uF caps in series with each signal generator lead, but that made the GFCI outlet that protects the basement outlets make a weird buzzing noise, so I quickly disconnected it all.
Any advice welcome...
--
Ron Ramirez
Ferdinand IN
