Model 421
More information about the unique amplifiers made by Magnatone and Valco

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"For Student & Artist, An ideal amp. With Built-in Tremolo & featuring Magnatone's (Pat.) True-pitch FM vibrato that meets the exacting demands of professional musicians. " ....1964 catalog hype

The model 421 has 3 inputs labeled High, Med, and Low. The 1st preamp section is a 6AV6 and half a 12AU7 tube for the volume and a tone controls. The 2nd half of the 12AU7 tube is used for the pitch-shifting vibrato. Half a 7025 for the low frequency oscillator. It is switchable from vibarto to tremolo. The other half of the 7025 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 $129.95 including the footswitch. Notice this model has a black control panel with white lettering (opposed to a silver panel with black letters, see below). Approx. 3 Watts Serial Number: Unknown Owner: Unknown Photo: © Unknown.

For more Information contact: Magnatone-Valco discussion group Vibroworld has Magnatone Parts

Here is another model 421. Notice this model has the silver control panel with black letters. Too bad someone destroyed the original cabinet and made it into a head. The transformer date code reads: 789-435. Owners of the model 421 say "The model 421 sounds nice and clear with lots of overtones when driven pretty hard. You can get full range of tones from it with plenty of low-end and clarity - it has a nice and pure tube warmth."

Approx. 3 Watts
Serial Number: 1398
Owner: Michael Brown
Photo: ©2002 Michael Brown. Used by permission.

For more Information contact: Magnatone-Valco discussion group Vibroworld has Magnatone Parts

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Updated November 29th at 11:37 am PST
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