AC-2-C amplifier

Wooden case with bakelite panel. Price in 1922 was 80 us$, in 1923: 55 US$. Metal tube socket skirts are double-slotted to accommodate 45 degree offset tubes like VT-2, WE 205, etc. as well as standard UV / UX based tubes.

An owner ("firebottles") wrote: "The amp was both sold and leased by Magnavox, and it was designed to be used in different applications, including public address systems, where -- when paired with an appropriate input device, such as a hand transmitter, a phonograph reproducer or an early regenerative radio -- it could power a two-coil Magnavox Telemegaphone horn loudspeaker to deafening volumes. The amp's unique tube sockets have dual guide pins and can accomodate either conventional 01A triodes or Western Electric 205-D tubes. This is an early DC-powered amplifier.  
If you want to power it up, you'll need an appropriate power supply (such as an ARBE III), an appropriate input device (such as an early battery radio), and an appropriate output device (such as a 1920's horn speaker).  The amp was not designed to work with modern, low-impedance high fidelty equipment, and I would not recommend that anyone attempt to adapt it to that purpose.  Even when used with 205-D tubes and an impedance matching transformer, it is not capable of matching the fidelity of contemporary amplifiers". We like to add that the 205D is all right, but was on the market only since 1924. The UX201A was on the market since 1925 and the dome shaped 01A is only existing since 1932! Really correct would be the General Electric UV201A or the Western Electric 216A, both from 1922.

In questo link sono elencati 1081 modelli, di cui 499 con immagini e 831 con schemi.
Elenco delle radio e altri apparecchi della Magnavox Co., Commercial Wireless and Development Co.; San Francisco, later Fort Waye, IN