03-24-2015, 09:23 AM
I have also posted this to the other place. I apologize if that is bad form .
Here is where I am at. I discovered that when I attach a 4 foot length of wire to pin 4 of the 36 oscillator tube, the radio works beautifully. I can tune in stations reliably clear across the band. I can hear a zero beat of the oscillator in a small transistor radio that I hold nearby.
As soon as I disconnect the 4 feet of wire, the oscillator stops. The zero beat in the nearby radio dies. Reception across the band dies. I discovered this effect originally when I tried to connect a scope probe to pin 4 and the radio started working.
I have played with 2 different values of the #10 resistor, both 13,000 ohms and 8,200 ohms. Neither seems to make any difference.
I know the oscillator in this radio can be very finicky. I have done the whole baking of the oscillator coil and rewind of the tickler. I have checked tube voltages. I also have a length of antenna wire connected at all times to the antenna terminal. Performance degrades when I disconnect that, of course, but the oscillator does not stop. However operation of the oscillator seems completely dependent on the wire I connect to pin 4 of the 2 tube.
Do any of you that have experience with the radio have any suggestions?
Thanks!
Mark
Here is where I am at. I discovered that when I attach a 4 foot length of wire to pin 4 of the 36 oscillator tube, the radio works beautifully. I can tune in stations reliably clear across the band. I can hear a zero beat of the oscillator in a small transistor radio that I hold nearby.
As soon as I disconnect the 4 feet of wire, the oscillator stops. The zero beat in the nearby radio dies. Reception across the band dies. I discovered this effect originally when I tried to connect a scope probe to pin 4 and the radio started working.
I have played with 2 different values of the #10 resistor, both 13,000 ohms and 8,200 ohms. Neither seems to make any difference.
I know the oscillator in this radio can be very finicky. I have done the whole baking of the oscillator coil and rewind of the tickler. I have checked tube voltages. I also have a length of antenna wire connected at all times to the antenna terminal. Performance degrades when I disconnect that, of course, but the oscillator does not stop. However operation of the oscillator seems completely dependent on the wire I connect to pin 4 of the 2 tube.
Do any of you that have experience with the radio have any suggestions?
Thanks!
Mark