Demo of a 1923 Radiola Model 'RS'

While I had the ARBEIII power supply on the bench to operate the Atwater Kent Model 33, I thought I would try to get another 'shelf queen' operational - this time a Radiola Model 'RS' from 1923. This is a much simpler design using two WD11 directly-heated triode tubes in a very simple circuit comprising an inductively-tuned regenerative detector followed by an audio amplifier stage. The former owner had replaced the (rare, delicate and expensive) WD11 tubes with a pair of 'home brew' tubes, each fabricated from a test tube, a repro WD11 tube base and a Raytheon 5676 subminiature tube.

[@Xpian]

Cheers for this! What would the electrical source have been in the day? (I don't think valves to rectify AC were available until the late '20s, but I'm certainly no expert). By the way, I noticed in the schematic there is accommodation for two headsets. I know there were speakers available with a sort of Bakelite cygnet horn, but I remember my late father saying they weren't that easy to listen to in the very early days of (voice) wireless. I realise you weren't around in the day, but to your knowledge would there have been the ability to use one with a set like this or if there simply wasn't yet enough power to make it worthwhile? Ta again! (I don't half envy you :)

[@RadioRestoration]

The set would have been powered using batteries: 2 x 1.5cells for the filaments and 2 x 22.5 volt batteries in series for the B+ plate supply. This set was designed for use with a pair of high impedance headphones and would not have had sufficient power to drive a horn speaker with much volume.