12-20-2018, 12:04 PM
Hi and welcome,
>In a cardboard box I found a Cunningham CX-326 and National Union NX-171A and some te others, what “type(s)” are these?
The CX-326 is more commonly known as 26 tube. It's a low gain triode w/an odd filament voltage and current. Mostly used in ac TRF set from the late '20s. Was superseded by the 24A which is a tetrode and has a standard 2.5v heater.
NX-171A is known as a 71A and is a power triode use the audio output stage of '20s battery set or later ac sets in push pull. good for abt .75 of a watt per tube. 5v 250ma directly heated cathode.
>In a cardboard box I found a Cunningham CX-326 and National Union NX-171A and some te others, what “type(s)” are these?
The CX-326 is more commonly known as 26 tube. It's a low gain triode w/an odd filament voltage and current. Mostly used in ac TRF set from the late '20s. Was superseded by the 24A which is a tetrode and has a standard 2.5v heater.
NX-171A is known as a 71A and is a power triode use the audio output stage of '20s battery set or later ac sets in push pull. good for abt .75 of a watt per tube. 5v 250ma directly heated cathode.
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
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