07-09-2017, 01:45 PM
>Does this look like a close match?
Much better than the other one.
>2A5 and 6F6 are the same except for heaters?
Yes the 47, 2A5, 42, and 6F6 are all abt the same in terms of plate load resistance.
The exception is when the tube is wired as a triode, plate and screen grid strapped together.
Philco did this on a number of older High Fidelity sets like the 38-116, 116B, 200X, 18, and some others.
When configured like this the plate load is much lower around 3K per tube.
Much better than the other one.
>2A5 and 6F6 are the same except for heaters?
Yes the 47, 2A5, 42, and 6F6 are all abt the same in terms of plate load resistance.
The exception is when the tube is wired as a triode, plate and screen grid strapped together.
Philco did this on a number of older High Fidelity sets like the 38-116, 116B, 200X, 18, and some others.
When configured like this the plate load is much lower around 3K per tube.
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
