12-19-2023, 10:42 AM
The 19 specs
https://frank.pocnet.net/sheets/021/1/19.pdf
Vs the 42 specs
https://frank.pocnet.net/sheets/021/4/42.pdf
The two things to look at are the plate load resistance and the plate current. The 19 can haul down 50ma where the 42 is at 34ma/250v. This is good the primary should be able to handle the current from the 42's plate.
The plate load resistance of the 19 is going to be high because it's configured as a push/pull output stage. Each plate requires a load of 10,000 ohms, totaling 20,000 across the primary of the transformer. Remember this is ac impedance not dc resistance. The 42 is looking for about 7,000 ohm load.
And you still need a some sort of a inductor to replace the fc.
https://frank.pocnet.net/sheets/021/1/19.pdf
Vs the 42 specs
https://frank.pocnet.net/sheets/021/4/42.pdf
The two things to look at are the plate load resistance and the plate current. The 19 can haul down 50ma where the 42 is at 34ma/250v. This is good the primary should be able to handle the current from the 42's plate.
The plate load resistance of the 19 is going to be high because it's configured as a push/pull output stage. Each plate requires a load of 10,000 ohms, totaling 20,000 across the primary of the transformer. Remember this is ac impedance not dc resistance. The 42 is looking for about 7,000 ohm load.
And you still need a some sort of a inductor to replace the fc.
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
