07-16-2016, 05:29 PM
I thought I'd revisit the Admiral. Have been using it but the audio sounds a bit muffled. I quick look at the schematic shows why. It has a rather large cap across the primary of the output transformer. Changed that for a smaller one and added a bypass cap to the cathode of the 50A5. This adds a little bit of audio gain and increases the low frequency response. A lot of AA5's don't have a cap there because it adds to the cost and it can make 60cy hum sound worst. I did add an extra 47mfd to the filter making a total of 141mfd originally it had 80.
It's playing nice and loud now with a much brighter sound. Have been using to listen the a local station that plays otr on Sat nights so I'm all set.
http://www.nostalgiaair.org/pagesbymodel...000212.pdf
Terry
It's playing nice and loud now with a much brighter sound. Have been using to listen the a local station that plays otr on Sat nights so I'm all set.
http://www.nostalgiaair.org/pagesbymodel...000212.pdf
Terry
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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