The Fine Things are Always Hand Made
Cody - Do not power the power supply without it being connected to both the set and the speaker. The voltages will be too high without the load of the tuner and this can easily damage the amplifier. Scott sets must be fully connected before applying power unless you use a Variac transformer. With a Variac, you can test the amp separately at a greatly reduced line voltage to protect the components. I usually replace the caps with 10@450v units.
That said - what is the serial number of the tuner? Can you post some pictures for us?
Thanks...D-334 is the entire serial number. I can't tell you a lot about the date on this set, no info in the D prefix. However, all the AW15 sets were built from March 1934 to about May/June 1935. Also, if you have not found it - the Scott Info Archive (link near the top of the page) has data on all Scott sets. Look in Set Folders, then in Allwave 15 and you can find all the info on your set. WARNING: AW15 sets vary widely - almost no two are the same. You will NOT find an exact schematic. But the general info on the sets is good. The AW15 is the worst for this variability - it was a transitional set from the AW Deluxe to the Allwave High-Fidelity. Many experiments...
This configuration was used by several companies including Hammond organ, which used two 12inch Jensens with different values for the field coils. They also used the quad 2A3 output tubes. I had one of these amps in a Hammond tone cabinet. Later versions used the same speakers, but with a quad 6V6 set of output tubes. I have one of these in service still.