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I've got an AK 40 that I use with an RCA 100-A speaker (better volume and power than the AK units I've tried).
These are finicky and interesting beasts having strong tubes is important for decent reception...Heck you can even change sensitivity by shuffling the type 26 RF and AF tubes. The gain is low and there is NO AGC so RF signal strength translates directly to audio gain, and weak signals will have very little volume (medium ones ain't much better). One trick with these is to loosen the set screws on the end pulleys with a station tuned and adjust the tuning condensers for best volume so the caps track each other better. You will need a long wire to get any stations that are not local and or nearish 50KW flamethrowers. I use a air core loop out of a 40's knight radio as an antenna for mine, and it only gets the local Milwaukee stations with decent volume. I can get the Chicago flamethrowers but with rather weak volume. Your set could probably benefit from new coupling caps and a check of resistors on the tuner chassis.
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