04-13-2020, 05:11 PM
Bob
Thanks for the input. I did get the oscillator to run by dropping the 11K resistor all the way to 1K
and changing R3 (70K)….It was out of tolerance.
I also installed a #36 tube for the RF
one of the schematics called for a 39/44
On your suggestion I rechecked the RF transformer.
It seemed resistances came up defying common sense.
I have Coil #1 out of the radio and it reads 19.3 ohms on the primary
However the secondary reads across the coil 7.57 ohms
from the bottom of the coil to the center tap 6.55 ohms
from the center tap to the top of the coil to the center tap 7.75 ohms
I would expect the total coil resistance to be 7.75 + 6.55...14.30 ohms total ??
I have no clue as to what is going on here?
I will probable unwind it to try to figure out what gives.
Tom
Thanks for the input. I did get the oscillator to run by dropping the 11K resistor all the way to 1K
and changing R3 (70K)….It was out of tolerance.
I also installed a #36 tube for the RF
one of the schematics called for a 39/44
On your suggestion I rechecked the RF transformer.
It seemed resistances came up defying common sense.
I have Coil #1 out of the radio and it reads 19.3 ohms on the primary
However the secondary reads across the coil 7.57 ohms
from the bottom of the coil to the center tap 6.55 ohms
from the center tap to the top of the coil to the center tap 7.75 ohms
I would expect the total coil resistance to be 7.75 + 6.55...14.30 ohms total ??
I have no clue as to what is going on here?
I will probable unwind it to try to figure out what gives.
Tom