1951 Zenith Porthole Question

[zenithfan1]

I'm going to do some more research on this, now it has me confused. You'd think the dumb manuals would be clearer, but it don't surprise me. I'm not giving up yet!!

[John Marinello]

Dual voice coil on that one.

[Ampico-kid]

Thanks for the information John, although I guess that sort of leaves me high and dry. I'd imagine 12" dual voice coil full range speakers are not all that easy to come by.

I'll have to come up with some sort of a switch using a relay and the on/off switch of the TV. I'd imagine that the TV audio output should have override preference to the AM/FM.

Thanks again for all the help.
Bob.

[John Marinello]

I gave you bum info, sorry about that!

The speaker has a single voice coil. The leads are paralleled right at the speaker terminal.

[Ampico-kid]

Hi John;
Thanks for the updated information. I appreciate the effort. Looking at the schematic I would not have guessed that to be the case (using a single voice coil speaker that is....).

On the tuner amp one side of the output transformer is grounded to chassis. On the TV amp both sides of the output are floating. I did try hooking them both up to the speaker voice coil at the same time and didn't notice any ill effects, although the high end of the TV output seemed to drop off a little. But aside from that small change, everything else seemed to work fine.

Thanks again.
Bob.