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Fairbanks Morse Model 8a Problem
#2

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


Messages In This Thread
Fairbanks Morse Model 8a Problem - by bm071 - 01-15-2016, 10:23 AM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-18-2016, 10:24 AM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-18-2016, 10:40 AM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-18-2016, 08:37 PM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-20-2016, 10:19 AM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-20-2016, 06:55 PM
RE: Fairbanks Morse Model 8a Problem - by bm071 - 01-20-2016, 06:59 PM
Fairbanks Morse Problem Update/ Guidence? - by bm071 - 01-16-2016, 12:51 PM



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