But this time I had to bend over and carry it out to the truck at arms length. Did I mention that it was dirty? I don't want to be more descriptive, but, it just wasn't something you wanted to touch. OH(!) what we will do for a historic radio. With all of the dials caked with ?? and the meter upside-down, the metal box was just not the kind of radio that I am usually attracted to. But this time it either had to be saved or risk going to the dump. Oakley is well into his 90s and sharp as a pin but housework was getting to be too much for him. So he was moving.
One of the differences between this radio and the later PR-10 seems to be the IF frequency. The PR-10 has an IF running at 432.5 kHz but this radio seems to want to be tuned around 450 kHz. Though I could find no specific documentation, the IF was running near 450 kHz when I finished the restoration. I tried to push it down to 432.5 and while it would go there it lost a lot of gain and the BFO just would not work. So simple using performance and what I expected from the range in the IF transformer tuning caps, I reset it to about 452 kHz. I had one IF transformer that was intermittently noisy from a bad ground but I found that and fixed it.
The chassis was in good shape.
The rubber friction drive components for the tuning mechanisms were also replaced at the stage.
So I had this Philco 20 speaker laying around. I stuck a new cone in it. The specs on the FC and output transformer were close enough. And it works just fine.
Below is a video of the All-Wave in operation.
A few notes:
It is frequently necessary to "0" the S meter (in this case "R" meter)
The BFO needs to be retuned over time and band changes. You can 0-beat it or just adjust the output for the highest gain on the S meter.
The BFO was intended to receive CW transmissions at the time the radio was built. In the video I use it to generate a carrier needed to demodulate single sideband (SSB). It is not ideally suited for this purpose. The demonstration of the CW reception demonstrates its original purpose. In several of these clips I had not yet found the poor ground in an IF can. So later the noise floor was dropped considerably.
Most of the "upgrades" mentioned at the site above were incorporated into this radio. There is a significant difference in the construction of the BFO circuit. I hope that you can make out my notes in the Riders Manual below. Yes, the grid (top cap) is grounded.