07-29-2007, 11:01 PM
Ron,
I took out all of the coils and measured the resistance, and they all measure exactly to the ohm what they are supposed to. I checked with (2) meters. The only problem I showed was on the oscillator coil, which looks original, the primary tests at 11.5 ohms instead of 3.4 ohms. I pressed on the coil and it went down to 9 ohms and when I released, it went back up to 11.5. The wire used on this is very fine gauge, much smaller than the antenna primary or than the secondaries. Do you know what gauge to use? I show 18 or 19 windings, can you confirm this? I was thinking that this was not the culprit either, as the oscillator showed very stable all over both bands. I get intermittent gain increases when the unit is on for the first 20 minutes, then stabilizes. This happens with different 6A7 and 78 tubes too. If I use a 50 foot antenna, the problem is worse at the lower end of the AM dial than when I use a 10 foot antenna. The antenna trimmer seems to peak the 10 foot antenna better than the 50 foot. That is the state of affairs now, at least. Thanks for your help. Ron M.
I took out all of the coils and measured the resistance, and they all measure exactly to the ohm what they are supposed to. I checked with (2) meters. The only problem I showed was on the oscillator coil, which looks original, the primary tests at 11.5 ohms instead of 3.4 ohms. I pressed on the coil and it went down to 9 ohms and when I released, it went back up to 11.5. The wire used on this is very fine gauge, much smaller than the antenna primary or than the secondaries. Do you know what gauge to use? I show 18 or 19 windings, can you confirm this? I was thinking that this was not the culprit either, as the oscillator showed very stable all over both bands. I get intermittent gain increases when the unit is on for the first 20 minutes, then stabilizes. This happens with different 6A7 and 78 tubes too. If I use a 50 foot antenna, the problem is worse at the lower end of the AM dial than when I use a 10 foot antenna. The antenna trimmer seems to peak the 10 foot antenna better than the 50 foot. That is the state of affairs now, at least. Thanks for your help. Ron M.
