1925, to replace the acoustic phonograph horn built into his guitar.
Since mid-’20s amplifiers required large batteries for operation and produced very little power, it makes perfect sense that Beauchamp opted for mechanical stimulation instead of electrical.
Serial numbers were stamped into the center of the speaker’s magnet and these fit into the standard numbering scheme of the instruments, e.g., amp numbers B39 (originally purchased with guitar B69) and a later example, B646.
Since the 56 was used for the preamp function and generally either a second tube or a transformer is needed for the phase inverter, let’s presume there’s a transformer inside the chassis (there are a number of methods to invert phase in the output section, but they are inherently high in distortion and probably would not have been used).As for the guts, chances are good it wasn’t much different from the first Ricks that followed. ” modestly accompanied the Hawaiian guitar and amplifier set in the original promotional flyer and it’s important to remember that this was an inseparable set — no amp, no electric guitar. 1934-’35, .50) More information is available on this variation of the initial amp, as a few examples have turned up.Two input jacks and an AC power cord were stock back panel devices, with a screw-in house fuse located behind the rectifier tube on the top side of the chassis.Little information is available on the pre-Rickenbacher Electro amps, since an existing example cannot be located (alright, who’s got one? The heavy-duty buckled handle would remain on this model for many years.Missing from later editions were the metal corner protectors, plus the grille appears to be a metal mesh instead of cloth.This was more in keeping with Adolph Rickenbacher’s approach to mass production – don’t use wood!