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More information about the unique amplifiers made by Magnatone and Valco
| "Created especially for top performance by Magnatone - Starlite 431 with built-in Tremolo & variable reverb plus the exclusive true-pitch vibrato* is the most ideal amplifier...In Quality...In Price" ....1964 catalog hype
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This amp came into our shop for some type of repair. We never got to repair it but here are the details. The model 431 has 3 inputs labeled High, Med, and Low. The 1st preamp section is a 7025 tube with a volume and a tone control. The 1st half of a 12AU7 tube for the pitch-shifting vibrato and half a 7025 for the low frequency oscillator. It is switchable from vibarto to tremolo. The reverb pan is driven by the other half of of the 12AU7 and the reverb return is amplified by half a 7025.
 The dry and reverb signals are mixed with half of a 12DW7 the other half is used for the phase inverted before going to a 6HU8/ELL80 twin Pentode power tube. Note: the printed schematic has a typo error. It reads 6UH8, it should read 6HU8 A push-pull output transformer drives the 10-inch 4-ohm speaker. Original list price was $199.95 including the footswitch.
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