EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

So, it looks like an AW23 speaker, but it doesn't have the two plugs for the tweeters and the stub cable (and no stub cable). The connector is like that used on the pointer Philharmonic (two large pins not together, not like a 23). Pin testing shows it should work on a Philly - but it is a 12 in and no Philly style tweeter connection either. But tagged Scott...I have two of these BTW...the other one has an AW23 style plug on it and tested it with an AW23 and it works great. Any thoughts appreciated. It isn't an extension speaker either - the connections inside the "Maganavox" door are the same as a 23 speaker. The manuals show a very different terminal strip for the extension speakers.

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Comment by Kent King on February 14, 2022 at 11:39am

Thanks for this....it will take me some time to review the notes and the existing diagrams. No doubt it works, I will see if I can gain better understanding...

Kent

Comment by Fran Mayer on February 14, 2022 at 10:58am

I did pull the speaker and tweeters out of the AW23 this weekend. I then remembered why I had a professional restore the set :-).

Attached is a word doc with photos that might help in understanding the circuit. If you need any additional info, let me know.1

Fran

Letter%20showing%20tweeter%20connections%20on%20speaker.docx

Comment by Fran Mayer on February 10, 2022 at 2:33pm

Hi Norman,

I don't have a circuit for the tweeters sketched already, however, I would be most happy to do so this coming weekend.

Fran

Comment by Norman S Braithwaite on February 8, 2022 at 10:53pm

Okay, that's interesting because without the tweeter sockets the resistor would presumably be in parallel with the tweeter field coils.  That may work but I have to wonder how correct bias was developed and excessive current was avoided.  By any chance could you sketch the tweeter circuits?

Norman 

Comment by Fran Mayer on February 8, 2022 at 10:25pm

Here is the ceramic power resistor.

Comment by Fran Mayer on February 8, 2022 at 10:24pm

Comment by Norman S Braithwaite on February 8, 2022 at 10:08pm

The one with the hardwired tweeters would not have had the bleeder resistor.  The 12-inch Magnavox speakers without tweeter sockets were used with the Quaranta sets.  I strongly suspect that unused stock was reallocated for use with late AW-23 sets near the end of the AW-23 production.

Norman 

Comment by David C. Poland on February 8, 2022 at 7:40pm

Perhaps late in the 1937 era of the AW-23 (with Phillys already in production) Scott had to make do with this version of the speaker. Looks like a typical terminal board with familiar embossed info on the terminal strip. 

Does this version speaker have the big tapped ceramic power resistor in the pedestal base? 

Comment by Kent King on February 8, 2022 at 3:14pm

Thanks - so a standard speaker connection inside - looks just like the two I have. I'll have to sketch out how you'd connect the tweeters directly - you'd need to have all 3 speakers plugged in to operate the set, without the plug to swap the tweeters out. 

Kent

Comment by Fran Mayer on February 8, 2022 at 2:10pm

Happened to have another picture of what you asked

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