[ARC5] WWII Aircraft Reciever AF Output

[Mike Morrow]

>I think a couple of hundred milliwatts is actually quite a lot of audio.
>
>Run at normal voltages and properly matched to a modest speaker, the audio
>should suffice for most applications.

John,

That was the point I was trying to make...that few of these fine old
receivers should need more AF output to drive a speaker.

One sometimes reads old ham conversion articles claiming that such-or-such
surplus receiver didn't have much AF output because it would have fed into
an interphone amp.  That meant that the writer knew little about how WWII
interphones worked.  In-service critical use in a very noisy environment
with multiple headphones that were fed in parallel (impedance mismatch!)
from raw un-amplified receiver AF output suggests that there should be
enough AF output from a healthy set to drive a ham shack speaker.

That, at least, was my experience 35 to 45 years ago when I still powered
these old relics up.

Mike / KK5F