01-05-2014, 09:08 PM
Tonight I was doing the switcheroos.
First of, I noticed that the radio sounded unusually well tonight, nd sure enough there was very little of that hum coming through when tuned in the station. I noticed the him changes during the day with that station. They played "I'm a believer" and it sounded very nice. Nothing close to 37-116 but that was not ever expected.
Then when the program changed and they started playing something with a bit more distortion, I switched the detector tube with another 24. The sound became worse, at least subjectively, and became better again when the tube was replaced. I tried various tubes in teh detector socket and the one that was there sounded better than others. Strangely enough this is the tube with the lowest mutual conductance.
Then I placed the last tube thart was in the radio I did not try, the original Philco globe 24, and subjectively it sounded a bit softer and less raspy, so I left it there. Other tubes' swapping did not matter.
The second one was using the 90's speaker in the console 20.
The 20 also played unusually well tonight.
Although I stated before that the distortions are similar when I transferred the speaker in the 20 the distortion seemed to migrate with it to a good degree.
All this being highly subjective and a bit confused, I think the problem might be many-fold, including possible output transformer impedance mismatch, the detector being what it is, the mentioned before different depth of modulation, all of it combined.
Well, I realized I am yet to change the tuning cap grommets which are totally destroyed.....plan a trip to Lowes tomorrow.
First of, I noticed that the radio sounded unusually well tonight, nd sure enough there was very little of that hum coming through when tuned in the station. I noticed the him changes during the day with that station. They played "I'm a believer" and it sounded very nice. Nothing close to 37-116 but that was not ever expected.
Then when the program changed and they started playing something with a bit more distortion, I switched the detector tube with another 24. The sound became worse, at least subjectively, and became better again when the tube was replaced. I tried various tubes in teh detector socket and the one that was there sounded better than others. Strangely enough this is the tube with the lowest mutual conductance.
Then I placed the last tube thart was in the radio I did not try, the original Philco globe 24, and subjectively it sounded a bit softer and less raspy, so I left it there. Other tubes' swapping did not matter.
The second one was using the 90's speaker in the console 20.
The 20 also played unusually well tonight.
Although I stated before that the distortions are similar when I transferred the speaker in the 20 the distortion seemed to migrate with it to a good degree.
All this being highly subjective and a bit confused, I think the problem might be many-fold, including possible output transformer impedance mismatch, the detector being what it is, the mentioned before different depth of modulation, all of it combined.
Well, I realized I am yet to change the tuning cap grommets which are totally destroyed.....plan a trip to Lowes tomorrow.