05-06-2020, 06:49 PM
Hello all, new on this forum. Restoring a 70 someone gave me years ago to keep me busy. All caps restuffed, new resistors except the 51k at oscillator, some new wiring, and cleaned up.
Ordered new 7k 8 ohm transformer to push 8 ohm speaker - might rebuild the original later. In the meantime, the radio plays good, but checking the output transformer seems it has shorted turn in secondary. I measure raw resistance 453.1 ohms primary, but only .02 ohms .02mh on secondary. Does anyone know what they measure on one that is good? 5k perhaps? Speech is fine, but music is garbled, I am using an 8 ohm speaker at the moment with the original output, big mismatch, don't think it should be this garbled though. I did take out the field coil with 3100 ohms to feed D wireround point.
Edit: I meant to say secondary of around 5 ohms.
Ordered new 7k 8 ohm transformer to push 8 ohm speaker - might rebuild the original later. In the meantime, the radio plays good, but checking the output transformer seems it has shorted turn in secondary. I measure raw resistance 453.1 ohms primary, but only .02 ohms .02mh on secondary. Does anyone know what they measure on one that is good? 5k perhaps? Speech is fine, but music is garbled, I am using an 8 ohm speaker at the moment with the original output, big mismatch, don't think it should be this garbled though. I did take out the field coil with 3100 ohms to feed D wireround point.
Edit: I meant to say secondary of around 5 ohms.
