Setchell Carlson...588 dial, 407 cab, 420 chassis(?) Serious need of a schematic.

[marloubow]

Hi guys...sure could us some help.

First time poster here at videokarma, but spend a good deal of time at AK.
This one is a puzzler. After researching the unit, it appears to be a "blended" radio.

I picked up this Setchell Carlson tube radio about a month ago at a Garage sale for $15.00. It was a "sort of working" unit. The broadcast sound was very "mechanical" like an a emergency weather broadcast. Could be the hybrid speaker.

By all the photos I've seen the cab is a Model 407, except the for the dial face (attached to chassis) and trim, which looks to be a 588. It appears to be the original dial face trim. But the 407 and 588 schematics do not show the same tube line up as mine.
I can't seem find a Setchell Carlson schematic that sports my tube configuration anywhere. A 330 is close.


So after much searching with no luck finding a schematic, I decided to just swap components value for value. This unit has been worked on before as there were plenty of component clippings still left at terminals. My efforts yielded only static. So without a schematic, any further effort would be a shot in the dark at best.

All tubes test low end of good. The bottom 25L6 has been replaced with a 25Z6.

And...I'm guessing the UTAH speaker is a replacement...or were they common to setchell carlson? Looks like a field coil / PM hybrid

Any help and info on this radio would be appreciated.
Martin

P.s. I am being mindful of the "hot chassis".