The first Allwave 12 Deluxe

[Kent King]

When Scott first introduced the new Allwave Deluxe set, it really wasn't much different than the 1931 2-dial set with the newly developed rotating coil assembly. The tube lineup includes four 24A tubes (1st det and three IF tubes), four 56 tubes (osc, 2nd det and two AF stages) and a 51 (RF), plus the amplifier. The set does not have AVC: front panel controls are just a 3-position sensitivity control and a volume control that varies the IF bais. These sets were produced in the summer and fall of 1932, by December, the Allwave Deluxe with AVC (using a Wunderlich 2nd det) was being sold.

The non-AVC 12 is fairly rare, having only been produced for a few months. I have one in my collection and have only seen a very few others. I finally began restoring mine after the holiday. The first challenge was a schematic - there is not one published in any Scott literature. There is a schematic in the November 1932 Radio Craft magazine (with an article written by Scott). However, this diagram doesn't show a power supply and doesn't entirely match my non-AVC set (serial #A-229). So I set about drawing a diagram for my set and amp. These are attached, I'll upload some pics of the set soon.

Does anyone else have a non-AVC Allwave Deluxe?

Kent

And yes, this is the set that prompted my earlier question about the dual speaker system.

[David C. Poland]

With the AW 12 and AW 15 models, works well to replace the filter caps and the metal bathtub one riveted in place in the tuner, (except the large ones across the back if they are larger, about twice the size of the others). Rather than dismounts the metal bathtub caps, I usually just disconnect then and mount modern film type next to each. a dab of hot glue works. Then, I slowly power up with a Variac and all tubes in place. Or a dim bulb tester with a 100 watt bulb which offers protection and reduces voltages, but enough voltage to allow sampling voltages on the B+ line and the plate and screen grid of every tube socket looking for any problem. The radio may well play on a strong station. This is when to find any out of range resistors o other faults.

Again - be sure the band switch is on broadcast band - full counter clockwise (about 8 o'clock)- before dismounting the coil wheel inside. And do not  move the band switch until you have re-mounted the coil wheel - important to avoid problems and damage to the switch in the antenna coil in the big can behind the dial.

[Richard Sowry]

David-Did you know where Barry got this radio?

Richard Sowry said:

Yes I did.  He said he had it for some time in his living room and was never going to get to restore it so he sold it.

[David C. Poland]

Yes, a local estate auction in Columbus maybe 10 years ago, we both attended.

You have a great fancy highboy radio cabinet, but not a Scott cabinet.

Scott was a custom radio builder and only built radios - each radio built upon receipt of a purchase order. Scott had an arrangement with Rockford Peerless Furniture Co for several cabinets at various prices exclusive for Scott customers.

Back then there were also a number of cabinet companies who made cabinets for radios - such as yours. I don't recall the company I identified at the time - but was east coast and had several fancy cabinets in a brochure.

[Richard Sowry]

 David, I found this post from Steve(Azenithnut) on Antique Radio Forum.  The company that made my cabinet is called Excello.  Interesting that they touted their own radio chassis and speaker which may have been the original receiver in this cabinet.  I know I have never heard of them.  I'm sure you are a member of ARF  The post is called "Scott radio ID and info".  Steve found a write up of this exact cabinet.

[David C. Poland]

Yes - I knew Barry was considering offering it.

[Richard Sowry]

Well I have some good news and some really bad news.  The good news is I had it receiving although low volume and running about 50volts low throughout the receiver.  My antenna is not good at all, about 10' running along the ceiling in my basement.  Maybe that's why the low volume.  

 Now the bad news.  I just had the antenna clipped on to the antenna terminal on the back of the chassis.  While maneuvering around to check some voltage the antenna popped off the terminal, skipped across the power supply chassis and popped the fuse.  Changed the fuse and attached the antenna better and powered it up.  NO POWER. Checked the high voltage winding of the power transformer and one side is bad.

  So, does anyone have a power transformer for an Allwave Deluxe that they would like to part with?

[Kent King]

Oh, that is bad...let me check. I have a large supply of parts and quite a few power transformers but don't know offhand if there is one for an AW12. I will let you know later today.

Kent

[Richard Sowry]

 Forget the  request for a power transformer.  I found the problem.  While maneuvering around I must have knocked a solder blob loose and it wedged behind the high voltage terminal of the rectifier.  After removing that, I checked resistance and it was good.  Powered it back up and it is receiving again, although low vol. still.  Now I have to work on that.  

[Kent King]

Good! I did have an AW12 transformer, but glad you won't need it. On the 12, check the big choke on the plate of the 1st audio. It is often (very often) open. 

Kent

[Richard Sowry]

I found the problem. A slight wiring error on my part.  Now it has lots of volume.  Thanks for the suggestion.

Now for another thing that may or may not be a problem.  On your schematic the 82k resistor going to the cathode of the 2nd detector.  On this radio it has a 28k 2watt.  The voltages are way high on the plate of the 2nd detector-201v.  According to the voltage sheet it should be 40v.  I subbed in a variety of different values in place of the 28k and the lowest I could get the voltage without going too high on resistance was 130v. with a 98k resistor.  Just wondering if any of this is OK and if I should leave the 98K in?

Thanks Dick

[Alex R. Whitaker]

Have you replaced the .1 cathode bypass cap on your 56 second detector, and is the 2K resistor within tolerance?  The 2K resistor could cause this problem, as could a bad connection to chassis ground.  Also, does your 56 tube test good, with no shorts?  

[Richard Sowry]

Yes all the caps have been replaced and all the tubes have been checked on my Jackson tube checker for shorts.  All 3 of the 2k resistors were within tolerance but I will check them again in the morning as well as the ground connections.  Thanks Alex