08-09-2023, 11:03 PM
I had a 51J4 for a long time and just sold it to a member here a yr or so ago. Used it for my main receiver in my ham station. I did one useful and simple mod to it to improve it's performance. That was to increase the value of the bfo coupling cap feeding the IF. The original is very small on the order of 5 or 10 mmfd. Increased it to about 50mmfd. This improves the signal handling ability when the bfo is used. Doesn't overload nearly as bad as before on ssb reception. It's not as good as converting the bfo tube circuit to a product detector but it's an improve over the stock.
I see you have the Heathkit transmitter that the osc puts out more than the final amp...[Image: https://philcoradio.com/phorum/images/sm...prised.gif]
de N3GTE
I see you have the Heathkit transmitter that the osc puts out more than the final amp...[Image: https://philcoradio.com/phorum/images/sm...prised.gif]
de N3GTE
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!
Terry
