[Milsurplus] 3Q5 tube used for what?

[Bruce Gentry]

The 3Q5 was a popular audio output tube in late 1930s and some postwar 
battery portable radios. It is fairly close to the characteristics of 
the 3V4, but I think it puts out a bit less power. It was not as popular 
as the 3V4, and I made adapters to substitute 3V4s for broken or missing 
3Q5s. I think the R-100 morale receiver had one in paralell with a 25L6, 
the 3Q5 didn't receive filament voltage when the receiver was operated 
on line power, and  the 25L6 sits  cold and idle when batteries are 
used. If I am not mistaken, the R-100 uses the cathode current of the 
25L6 to light the remaining battery tube filaments when the receiver is 
operated on line power.  I have a couple R-100s in fair shape  I will 
restore sometime unless someone here takes interest in them first.

      Bruce Gentry, KA2IVY

On 8/13/13 10:19 AM, Rob Flory wrote:
> Having found a couple in my inventory, I'm pretty sure it was in a radio I
> used to have, but I can't figure it out.  Must have been a radio I forgot I
> had.
>
> What radio(or radio test equipment) uses a 3Q5(VT-221) tube?
>
> RF
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