Magnatone Guitars!

New for Fall 2013, a complete guide to Magnatone guitars and the stories behind them!

1938-1960 Steel Guitars

1956-1963 Bigsby/Barth Era

1964-1966 Starstream Era

 

Magnatone Custom M9

Years 1963½-1964
Series Custom Series
Channels two
Power 2x 7189A
Power Bias cathode
Preamp 2x 7025
Vibrato 12DW7 (oscillator), 12AU7, four varistors
Phase Inverter 12AU7
Speaker 15" 16ohm
Speaker 3" 8ohm
Rectifier solid state
Output Trans10K:8ohm
Output 38 watts peak
Weight 45 lbs.
Height 23.25"
List Price $340

The M9 is a 2 channel amp with F.M.Vibrato driving a 15" speaker. Each channel has "loudness", "tone", and "contour" controls. A stereo input jack allows a single instrument cable to feed signal to both channels (jack is a stereo connector, not a mono jack). The four varistor vibrato is only on "Channel One". The M9 used a cathode-biased pair of 7189A power tubes. This distinction made the M9 (and M8) unique among many of its stable-mates that used a fixed-biased output section with 7189A's

 

While both the M8 and M9 were cathode-biased, only the M9 used the larger 10K:16ohm ultra-linear output transformer.

M9's were introduced in the second half of 1963 as part of the new line of Custom Series amplifiers. By mid 1965, the entire line was revamped and several models were discontinued. The M10 survived as the 1x12" M10A, and the somewhat similar M8 and M9 were among models axed.

 

The M9 pictured at right has an acrylic badge that was used a few Custom Series amps. See Custom Series Dating for more about this nuance.

 

Schematic.

M2 M4 M6 M7 M8 M9 M10 M12 M13 M14 M15 M10A M13A M15A M20

DA/MagnatoneAmps.com

 

 

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