05-31-2023, 03:55 PM
The radio is proving to be just a bit of a nightmare. Due to the very dense packaging tracing things is difficult, and there are discrepancies between the only sch I could find and what is in this chassis. Plus I can see couple of dead end parts, that are simply not connected. One of them is 50K resistor that is connected to the Neg of 10uF cap under the volume pot. Which means the lower end of the pot had no DC bias on it at all.
The radio worked so this did not stop it from making sounds, but it is not good.
So here it is there now (the 47K).
Some other things too. Like that free hanging electrolytic I showed on one of the photos, it was connected one solder post over the one that it was supposed to go to. That is, instead of filtering some plate voltage, it suppressed the feedback that comes with that 0.1uF cap from the speaker to the volume pot circuit. Again, that would not keep the radio from singing, but it is wrong.
I am sure there are variations, but there is not a whole lot of docs on this radio, except maybe in Radio Museum.
PS. Was able to download a sch from Radiomuseum that seems to be closer to mine; at least there is that 2.5nF cap between the plate and the screen grid of the output tube that the other sch does not show.
The radio worked so this did not stop it from making sounds, but it is not good.
So here it is there now (the 47K).
Some other things too. Like that free hanging electrolytic I showed on one of the photos, it was connected one solder post over the one that it was supposed to go to. That is, instead of filtering some plate voltage, it suppressed the feedback that comes with that 0.1uF cap from the speaker to the volume pot circuit. Again, that would not keep the radio from singing, but it is wrong.
I am sure there are variations, but there is not a whole lot of docs on this radio, except maybe in Radio Museum.
PS. Was able to download a sch from Radiomuseum that seems to be closer to mine; at least there is that 2.5nF cap between the plate and the screen grid of the output tube that the other sch does not show.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
