EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

Even Scott acknowledged different versions of the Allwave 15. In the 1936 Accessories brochure, they list spare tubes for the Type I, 2 and 3 AW15. The major differences are in the mixer tube (could be 58, 57 or 2A7), the 2nd detector (Wunderlich or 55), also the right hand control varies (3 position, variable, etc.). I've got detailed info on about a dozen AW15 sets. By serial numbers, we have almost 250 sets. 

Researching these differences is difficult, some sets were modified when returned for service, or even on request of the customer. Some were traded in on AW23 sets, and we have good reason to believe they were upgraded before being sold. So a study by serial number has potential issues. However, here is the assignment:

Please send me any AW15 info you have. I would like the following: serial number, mixer tube, 2nd detector tube, right hand control function. There are probably other differences we could grab, but this is a start. You can add info to this thread or email it to me at kent3256@hotmail.com

All this info will be summarized and shared. I have other info too - perhaps a detailed article on the AW15 will be developed from this!

Thanks everyone!

Kent

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Suggestion:  

1) Also include the antenna post arrangement.

All AW-15 sets have the usual black Ground post and black Antenna post. But early AW-15's also a pair of red antenna posts for a special short wave antenna along with a rear apron toggle switch to select between antennas. About the time the Wunderlich tube was dropped it appears the two red antenna posts were also dropped.

I have an AW-15 that appears to have been a Wunderlich set that was rewired for the 55 tube, as per a documented factory modification advisory.    (Wunderlich tubes became unavailable.)

2) Inspect the the 2nd detector socket (3rd back on the left side):  either   center red button   or    button embossed with 55.

If a Wunderlich tube was original, the center button was dark red, somewhat like the dark red base of the blue glass Wunderlich tube. The Wunderlich tube has a 6 pin base but no grid cap. The 6 pin 55 tube has a grid cap, hence part of the wiring change to upgrade a Wunderlich set to use a 55 tube. Later production sockets are embossed "55".

Or you might even have a 55 tube with a wire from a bottom pin to the grid cap as a quick & dirty conversion. 

3) some early AW-15's had an additional outboard  "static" switch in addition to the front right control escutcheon labeled either "Static" or "Sensitivity".      (My two AW-15 set escutcheons says "Static" and my 3rd AW-15 says "Sensitivity" control).

My allwave fifteen serial f371 has the two red antenna posts and the switch on the rear apron

It has a wunderlich detector with a dark red socket,

the right hand control is variable sensitivity,

tube lineup is 56 triodes and 58 pentodes,

there are only three bathtub filters fitted on the back wall of the chassis, the fourth is a separate inductor and 0.1uf cap, there is only one mounting hole for the inductor so must be original,

the bfo is injected into the wunderlich circuit through a 10pf cap and doesn't use proximity pickup like later sets

the power supply is an export type, the transformer has a 110v or 240v primary, this is selected by moving the internal fuse.

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