04-07-2008, 07:40 PM
Thanks for the info guys. I just wanted to be sure that there was not some product design change causing these caps to be added for performance reasons. I am comfortable now that they are not. After having rebuilt the bakelite blocks and the metal filter blocks, the radio plays very well.
On a side note, I still need to rewind the primary of the RF transformer, which is open. The radio plays beautifully with the open primary bridged by a 20K resistor. In fact, I am wondering if there is anything to be gained by rewinding the primary of this transformer? I see that the later Philco 70's use an open primary with the B+ feed to the RF tube plate (shunt fed) via what appears to be an RF choke.
Ed
On a side note, I still need to rewind the primary of the RF transformer, which is open. The radio plays beautifully with the open primary bridged by a 20K resistor. In fact, I am wondering if there is anything to be gained by rewinding the primary of this transformer? I see that the later Philco 70's use an open primary with the B+ feed to the RF tube plate (shunt fed) via what appears to be an RF choke.
Ed
