Just acquired Scott 1936 All Wave 23 P649. Lights up but no reception. Tubes? Advise?

[Robert Sands]

Tubes all light and warm. Nothing on AM or 3.7 carrier, 7.25 carrier and 18.26 carrier broadcast from nearby antenna. Zilch. General advice is to replace all tubes or one at a time. What do you say, group. Hum low to moderate so speakers and audio working.

Robert Sands K7VO

[Kent King]

I concur with Alex, hum is almost always caused by leaky filter caps in the power supply. Most of the capacitors in the set will be leaky and the set will not perform as it should without some deep technical work. I usually replace all the wax caps in an AW23 as a matter of practice. There is a worksheet here on the site with a list of "tasks" to restore an AW23. The fact that it does play means all the transformers and such are good, that is a big plus. 

Kent

[Alex R. Whitaker]

Replacing tubes is the wrong advice.  Get the service information, from this site, for your particular chassis (or something close) and start checking your B+ and cathode voltages on each tube, starting with the power supply.  You probably have bad electrolytic filter capacitors in the power supply.  If your tubes are only warm, all through the set, then they are probably not getting any high voltage.  The 2A3s and the rectifier tubes should be able to give you a blistered burn on the end of your finger, and a few of the tubes topside will get pretty warm, too.  Tubes are seldom the problem with antique tube audio.  Connect your VOM negative lead to chassis ground, and use the positive lead to probe to check voltages on each tube, comparing them to the service literature.  If a voltage is more than 20-30% off, you have a problem.  Post any questions you might have, regarding this, to the forum.