A lot of small companies made radio's in the 1920's. Few schematics were included in Rider.
Check Stewart Warner 300 series by clicking on Resources, above. Your radio should be similar to one on that page.
Norm
:Hello: I recently bought an old battery operated radio which has a name tag on the front of Mirro-Dyne. There is no other tags or numbers that I can find. The tubes all 201A.There are five tubes.I found nothing in my Riders manuals and nothing on this web site. Any help will be appreciated. Thank you-Dan
Does your set work? Usually, not too much is wrong with them. Get all the tube filaments to light and check the B+ plate voltages at the sockets (Pin 3 of '01A tubes). Usually, there will be a lower B+ for the detector (e.g., 45V), and 90V for the other tubes.
Check the grid-leak resistor -- it's probably drifted way high, above the normal 2-3M. You can inconspicuously haywire a replacement resistor under the original grid leak holder, cover one end of the original resistor, and reinstall it for ornamentation.
Check the caps to make sure they're not shorted (probably OK). Also, check any wirewound resistors to be sure they're not open. Check the audio interstage xfmrs for open windings if the B+ is missing on any of the audio tubes or if there's no sound from speaker.
Check the resistance across the tuning caps -- should be a couple of ohms, just the resistance of the RF coil primaries. If near zero, probably bent, shorted tuning leaves.
Make sure the ON-OFF switch is working, and that the filament rheostats aren't broken. Squirt a little contact cleaner/lube into the rheostats, tuner-cap bearings, and power switch.