07-19-2018, 11:47 AM
Oh no not another dilemma! [Image: http://philcoradio.com/phorum/images/smi...on_eek.gif]
That's an easy one the 41-280 is a better performer than the 40-180. On most if not all of the '41 models Philco did a redesign of the front end and if stage. They don't use a rf amp but have a 2nd if amp along w/a better mixer circuit using two triodes (XXL's). The triode mixing circuit is much quieter that the more conventional pentagrid (6A7,6A8, 6J8,7A8, ect) or the pentode/triode like 77/76 used in the 16/116/660 ect.
I think if you set the two side by side you'll notice that the '280 as a lot less background noise and signal are stronger. That's known as signal to noise ratio (snr)
Happy rewiring!!
That's an easy one the 41-280 is a better performer than the 40-180. On most if not all of the '41 models Philco did a redesign of the front end and if stage. They don't use a rf amp but have a 2nd if amp along w/a better mixer circuit using two triodes (XXL's). The triode mixing circuit is much quieter that the more conventional pentagrid (6A7,6A8, 6J8,7A8, ect) or the pentode/triode like 77/76 used in the 16/116/660 ect.
I think if you set the two side by side you'll notice that the '280 as a lot less background noise and signal are stronger. That's known as signal to noise ratio (snr)
Happy rewiring!!
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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