I have an unusual E.H. Scott radio that perhaps some Scott expert can weigh in on.

It's ostensibly an All-Wave 15 superhet, c. 1934, but with differences. For the 2nd detector, it uses a Wunderlich tube rather than a 55.

Rider's All-Wave 15 schematics show a push-button that kicks in a beat-freq oscillator ckt. But my set's push-button engages what I think is a Q-multiplier ckt.

The nameplate does not list a model name, just "Ser. No. B-357."

Of course, Scott radios were claimed to be custom built, so I guess anything is possible.

:I have an unusual E.H. Scott radio that perhaps some Scott expert can weigh in on.
:
:It's ostensibly an All-Wave 15 superhet, c. 1934, but with differences. For the 2nd detector, it uses a Wunderlich tube rather than a 55.
:
:Rider's All-Wave 15 schematics show a push-button that kicks in a beat-freq oscillator ckt. But my set's push-button engages what I think is a Q-multiplier ckt.
:
:The nameplate does not list a model name, just "Ser. No. B-357."
:
:Of course, Scott radios were claimed to be custom built, so I guess anything is possible.

:I am a Scott collector/restorer/historian with about 50 Scotts.

There are at least seven known versions of the Allwave 15.

One of the early versions utilized Wunderlich tubes. There is even a documented factory modification which explains the replacement/upgrade of the Wunderlich with a 55, the last version.

Actually there are three different tube general configurations.

Any Q multiplier generally would imply other controls to run same. Further, a Q multiplier would not be activated from a momentary contact switch, but rather a spst (minimally) switch to provide continued reception at the increased selectivity.

All known AW15 radios have the BFO. However you may have a radio on which some has freelanced to some degree.