06-27-2018, 10:13 AM
Fancy meeting you here.[Image: http://philcoradio.com/phorum/images/smi..._smile.gif]
To brush up on the jargon have a look here: http://www.bunkerofdoom.com/tube/man/
Scroll down the the RCA RC-15 manual. Study the 1st eight pages. This will give you a good
understanding of the elements inside the vacuum tube.
A lot of folks interchange the names filament and heater. Both light up but their purpose is
different. A filament acts as the cathode in what is known as a directly heated tube. This type of tube
has no separate cathode. A heater is used in an indirectly tube. It is fitted inside a small metal
tube and is isolated from the filament. That "tube" is the cathode. The heater is used to heat
the cathode so it can produce the electrons need to make the vacuum tube conduct.
To brush up on the jargon have a look here: http://www.bunkerofdoom.com/tube/man/
Scroll down the the RCA RC-15 manual. Study the 1st eight pages. This will give you a good
understanding of the elements inside the vacuum tube.
A lot of folks interchange the names filament and heater. Both light up but their purpose is
different. A filament acts as the cathode in what is known as a directly heated tube. This type of tube
has no separate cathode. A heater is used in an indirectly tube. It is fitted inside a small metal
tube and is isolated from the filament. That "tube" is the cathode. The heater is used to heat
the cathode so it can produce the electrons need to make the vacuum tube conduct.
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 "[-]")
