I just finished up a 1946 seeburg 146s symphonola jukebox restoration. Spent 6 long months worth of free time to complete it. The baby looks like it rolled off the assembly line. My question is in the tube amp. It sounds great and plays strong , but I'm getting a mild level crackling(popping) noise out of the speaker. This is not effected by turning the volume up or down. I can actually drown out the crackling if I play it loud enough. I traced, and retraced all my connections and solder joints. I cannot find what causes this noise. when I play around with any wire in the juke, it changes the crackling noise for better or worse. I thought I had a shorted wire. I checked all wires and found them fine. I unplugged all connections to the amp so its just the amp and speaker. The amp still makes the crackling sound. The speaker uses a field coil. The amp has been recapped, retubed and I replaced the resistors across the 6J7 and 6SN7 tubes. It still makes the crackling sound. I even tried another set of tubes. The amp is powered by the following tubes:
two 6L6 tubes
6J7
6SN7
5U4
Any thoughts would be greatly appreciated. This final problem is driving me mad. It's all I hear, even in my sleep.
ZSG
two 6L6 tubes
6J7
6SN7
5U4
Any thoughts would be greatly appreciated. This final problem is driving me mad. It's all I hear, even in my sleep.
ZSG