Allwave 23 Beat Oscillator Button

[Don Jackson]

I recently acquired a 7 knob Allwave 23 chassis and amplifier and will go through it for winter project. It came with a wood panel and all the escutcheons. So far, I have dusted it off and looked it over for obvious issues. When I took the front panel off was surprised to see 3 holes on the front, one large and 2 small. It soon became apparent these holes were the mounting configuration for the beat oscillator button on the 5 knob model. This set has the micrometer dial, so perhaps was sent back to Scott for an upgrade or maybe someone had another set and did the upgrade themselves. There is nothing suspicious looking about the wiring to the phono switch or the beat oscillator button. If someone added these controls they did a very good job, and it was done long ago. The serial number of this set is K-650, how would that number fit in the time frame? Also worth noting, about half the capacitors are Potter and the rest are Sprague, a few appear to have been changed but most appear to be original. There was a discussion in another thread here about Potter capacitors and it was generally agreed they were only used in the early models. It appears that this is an upgraded 5 knob set, which does not matter much. Has anyone seen a 5 knob set upgraded like this? It seems unlikely that it came from the factory this way. The set seems relatively unmolested and should clean up well so will be a fun project.

[Thomas Day]

I .have K486, which is a 5 knob version from around 1935. I have a second chassis also 5 knob, but with twin antenna posts. 

The second chassis had been seriously modified, and I was able to restore it using a combination of the early and late schematics. 

Does this chassis have 1 or 2 antenna posts?  

Thom. 

[Don Jackson]

Hi Thomas

This set has 2 antenna posts, I did not notice until you mentioned it. I have already restored another 5 knob set which had the single antenna post. Having gone through this process once, this one should be easier. 

[Norman S Braithwaite]

It is more likely that EH Scott Radio Laboratories was using up chassis punched for the 5-knob version for the new 7-knob version.  I have seen chassis with a mix of the Potter and Sprague capacitors manufactured during the transition of capacitor suppliers.  EH Scott Radio Laboratories was very effective at using stock on hand before ordering new stock.  There are many examples of this practice.  

Norman

[Don Jackson]

Norman

Thanks for your opinion, what you suggest makes perfect sense. I pulled off the coil wheel to have a closer look and all the wiring looks original, so it appears to have come from the factory like this.

[David C. Poland]

There is a design progression reflected in the above receivers. Scott was a small manufacturer and probably could ill afford to discard chrome plated chassis blanks after a model re-design. 

I have had the early 5 knob model. And also the early 7 knob model with one antenna post with a chassis like yours that had been punched for the BFO button under the dial knob and had the 2 additional controls instead. Indeed, the Roslyn cabinet panel also had been cut for that button, which hole was filled with a wood plug covered with a decorative tack.

My 3rd AW-23 is the late version with 2 antenna posts and micrometer dial. These features were part of the Fall 1936 AW-23 revision that also incorporated the new Scott Supershield Antenna Coupler (see Scott News October 1936). This enhancement included switching that obsoleted the outboard Antenna switch that had been part of the Scott Super Antenna since 1934 (a double di-pole with twin lead-in).

Also, Scott was known to make revisions to a set returned to the factory for repair work, upgrading it for some or all the current production circuitry.

After all, Scott was a custom set builder. We collectors have the opportunity to compare sets. The buyer of a new Scott at that time would be dazzled by the all that chrome and be in no position to ponder an unused chassis hole or two.