01-09-2014, 01:15 PM
Hi Morzh:
Yes on mine the cable comes from the radio to the speaker through a grommet and all of the wiring is inside the steel frame of the speaker. I did manage to get it all apart last night and try a different speaker and it sounds WAY better and you dont have to crank the volume near as much so I think I will send this one out to be re-coned.
One other thing I found when restoring the chassis was the center tap on the driver transformer was connected to ground and not the bias resistor like the schematic shows. On very close inspection it looked like a factory connection but I moved it anyway as I was puzzled by no grid bias on the 71a tubes and they were running very hot which is not normal. When I took the speaker apart I noticed a lot of the original potting wax was melted out, HUMM makes a person wonder how long it was like that, maybe right from new.
Gregb
Yes on mine the cable comes from the radio to the speaker through a grommet and all of the wiring is inside the steel frame of the speaker. I did manage to get it all apart last night and try a different speaker and it sounds WAY better and you dont have to crank the volume near as much so I think I will send this one out to be re-coned.
One other thing I found when restoring the chassis was the center tap on the driver transformer was connected to ground and not the bias resistor like the schematic shows. On very close inspection it looked like a factory connection but I moved it anyway as I was puzzled by no grid bias on the 71a tubes and they were running very hot which is not normal. When I took the speaker apart I noticed a lot of the original potting wax was melted out, HUMM makes a person wonder how long it was like that, maybe right from new.
Gregb
