I have a very important update about these extended leads.
http://www.vintage-radio.net/forum/showt...post809574
This is a VERY important update. For those who wish to d.i.y. these leads. I used my extended leads repairing a 62B. I am still convinced that these leads wires are correct. Only one improvement should be taken care of.... To be more specific the extended lead with the 8 way connectors.
I am still troubleshooting this 62B. Attaching both leads between the drawn out power audio plug in and the rest of the receiver I came to the conclusion that in AGC OFF mode there was lots of hum sounding like a broken microphone cable. Bad earth ??. In the AGC ON modus no problem. Touching these leads made me aware that they needed better earthing (shielding) they became sensitive to hand capacity. Pushing the 8 way connector to the chassis or connecting it with a alligator clip to the chassis the problem became very less. So the hum in a 62B turned out to be caused by only these leads. They pick up electromagnetic fields from the transformer/ smoothing coil. Also due to their length. After removing them. I started up the receiver. The hum was gone (except the very quiet hum you an expect from a valve receiver).
So a improvement should be made so that the connector shells themselves are earthened. And the leads should be shielded.
Any comment is welcomed by.
best regards.
Qwenix
http://www.vintage-radio.net/forum/showt...post809574
This is a VERY important update. For those who wish to d.i.y. these leads. I used my extended leads repairing a 62B. I am still convinced that these leads wires are correct. Only one improvement should be taken care of.... To be more specific the extended lead with the 8 way connectors.
I am still troubleshooting this 62B. Attaching both leads between the drawn out power audio plug in and the rest of the receiver I came to the conclusion that in AGC OFF mode there was lots of hum sounding like a broken microphone cable. Bad earth ??. In the AGC ON modus no problem. Touching these leads made me aware that they needed better earthing (shielding) they became sensitive to hand capacity. Pushing the 8 way connector to the chassis or connecting it with a alligator clip to the chassis the problem became very less. So the hum in a 62B turned out to be caused by only these leads. They pick up electromagnetic fields from the transformer/ smoothing coil. Also due to their length. After removing them. I started up the receiver. The hum was gone (except the very quiet hum you an expect from a valve receiver).
So a improvement should be made so that the connector shells themselves are earthened. And the leads should be shielded.
Any comment is welcomed by.
best regards.
Qwenix
