01-16-2016, 11:51 AM
Thanks to all who read my first post. I can guess that all of you figured out I was confused..and I was so here is the latest and acccuarte account of the problem I am searching for.
I finished replacing all resistors, caps, and filters. I also put in new tubes just to be sure. My problem is lower than average volume with a little distortion above 65%(almost like not enough wattage?).....I did a voltage check of the tubes and here is what I now have,
5y3...300v at pins 2&8...-54v at pins 4&6..spec is 245v and -95...high B+ and low bias..correct?
6l7....3oov at pin 3....150v at pin 4 spec is 240 and 105.
Similar pattern throughout th rest of the tubes. B+ voltage at the filter is 300v bias -54.
The field coil resistance is 795ohms cold, 839 after 2 minutes...spec is 1000 ohms hot. I did not want to play for too long with the high B+ v.
I do not have any specs on the transformer, only the schematic from Nostalgia Air.
Could I have a transformer issue or is there something I am missing to cause the low bias?
There is supposed to be an antenna lead and a ground wire, only one is left and I'm thinking since it goes to the a band selector
lug that in turn goes to ground...means itis the ground and not the antenna lead right? If so where would be a good place to attach a lead for antenna?
Bob
I finished replacing all resistors, caps, and filters. I also put in new tubes just to be sure. My problem is lower than average volume with a little distortion above 65%(almost like not enough wattage?).....I did a voltage check of the tubes and here is what I now have,
5y3...300v at pins 2&8...-54v at pins 4&6..spec is 245v and -95...high B+ and low bias..correct?
6l7....3oov at pin 3....150v at pin 4 spec is 240 and 105.
Similar pattern throughout th rest of the tubes. B+ voltage at the filter is 300v bias -54.
The field coil resistance is 795ohms cold, 839 after 2 minutes...spec is 1000 ohms hot. I did not want to play for too long with the high B+ v.
I do not have any specs on the transformer, only the schematic from Nostalgia Air.
Could I have a transformer issue or is there something I am missing to cause the low bias?
There is supposed to be an antenna lead and a ground wire, only one is left and I'm thinking since it goes to the a band selector
lug that in turn goes to ground...means itis the ground and not the antenna lead right? If so where would be a good place to attach a lead for antenna?
Bob
