04-22-2013, 03:28 PM
Just for info, the connection from the output transformer secondary to pin 1 on the antenna terminal strip is to use for alignment. You connect your VOM or VTVM to pin 1 to peak the audio voltage during alignment without turning the chassis over to connect your meter underneath. Philco also made an adapter for one of the tube sockets (don't remember which one) so their service techs could connect signal generators to that rather than to tube sockets underneath.
It was a minor convenience that they did that, but it is still next to impossible to reach the compensators with the chassis inside the cabinet. To align the dial you need to remove the chassis, put it back-to-back with the cabinet, reconnect the loop, align the compensators, and then reinstall the chassis. The dial alignment changes a little when you reinstall, but you can get it pretty close.
It was a minor convenience that they did that, but it is still next to impossible to reach the compensators with the chassis inside the cabinet. To align the dial you need to remove the chassis, put it back-to-back with the cabinet, reconnect the loop, align the compensators, and then reinstall the chassis. The dial alignment changes a little when you reinstall, but you can get it pretty close.
John Honeycutt
