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EH-150 ; Gibson Manufacturing (ID = 2522821) Ampl/Mixer
EH-150 ; Gibson Manufacturing (ID = 2522822) Ampl/Mixer
EH-150 ; Gibson Manufacturing (ID = 2609409) Ampl/Mixer EH-150 ; Gibson Manufacturing (ID = 2609410) Ampl/Mixer
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EH-150 ; Gibson Manufacturing (ID = 2522819) Ampl/Mixer EH-150 ; Gibson Manufacturing (ID = 2522820) Ampl/Mixer
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EH-150 ; Gibson Manufacturing (ID = 2609409) Ampl/Mixer
Gibson Manufacturing: EH-150 [Ampl/Mixer] ID = 2609409 1400x1050
Select picture or schematic to display from thumbnails on the right and click for download.
For model EH-150, Gibson Manufacturing Co., Kalamazoo (MI):
Handle is not original.
Country:  United States of America (USA)
Manufacturer / Brand:  Gibson Manufacturing Co., Kalamazoo (MI)
Year: 1937 ? Category: Audio Amplifier or -mixer
Valves / Tubes 7: 6F5 6C5 6C5 6C5 6N6 6N6 5Z3
Main principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 110 -125 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 12 inch = 30.5 cm
Power out
from Model: EH-150 - Gibson Manufacturing Co.,
Material Leather / canvas / plastic - over other material
Shape Tablemodel, high profile (upright - NOT Cathedral nor decorative).

There were at least four versions of this amplifier as follows:

Style 1:  1935 - 1936 with four tubes (6A6 6F6 6F6 5Z4 or 80) and 10 inch speaker

Style 2:  1936 - 1937 with six tubes (6F5 6N7 6C5 6N6 6N6 5Z3) and 10 inch speaker

Style 3:  1937 - 1941 with seven tubes and 12 inch speaker.  There was an early "transition" version from Style 2 that most likely was only made in 1937.  This is the model depicted on this model page.  It had the same schematic as Style 2 except that the 6N7 was replaced with two 6C5's.  The schematic on this model page is for Style 2 with revisions showing the two 6C5's.  The Style 3 "late" version substituted two 6L6's for the 6N6's.  The Style 3 late version also eliminated the protective leather corners at the top of the front face, and instead, had rounded corners.

Style 4: 1941 - 1942 that used  a tube phase inverter with a 6N7 replacing the transformer.  The rectifier was changed to a 5U4 and the three 6C5's were replaced with 6SQ7's.

Model page created by David Erali. See "Data change" for further contributors.

All listed radios etc. from Gibson Manufacturing Co., Kalamazoo (MI)
Here you find 21 models, 17 with images and 20 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.