Gibson 1937-1941 (1941) EH 150 Amplifier 3rd Series

1937 Catalog Y

The new EH-150 of 1937 was found in the pages of 1937's Catalog Y, above. The new 7 tube amp also  featured a new look. Instead of the 4 sharp corners found on the earlier amps, the top corners were rounded and the top leather ends were eliminated. The inside brown crinckle lining was replaced with a light cream colored leatherette lining.

The inside components changed significantly. The speaker size increased from a 10" to a 12" field-coil with the Gibson name on the magnet cover.

According to 'Vintage Guitar Magazine', 

     'A beefed up circuit employing seven tubes featured the relatively new 6L6 beam-power variety, in metal. The 5Z3 rectifier, 6C5 driver and 6F5 microphone channel preamp remained from the earlier model, but the twin triode 6N7 was replaced with two 6C5 triodes for the instrument and microphone channels. Power ratings were given for the first time, a respectable 15 watts'.

This 3rd generation EH amp would be used from 1937 up until 1941/1942, when it would be changed briefly to the 4th variation. Interestingly, 1942's 4th version EH 150 shared the same circuit design and the Giant EH 185 model. 

Large concert groups using Gibson EH185 & EH150 amplifiers. 1945 photo.
EH150 amplifier and prewar electrics.
Rare glimpse of the 1935 metal body EH150 with three EH150 amplifiers. Note the amps are the 1st EH style because of the 4 patches of leather on the front corners. The later had 2 patches on the front bottom corners only.
1937 Catalog Y
1941 EH150 amplifier
1937 Catalog Y; description con't next photo...
1937 Catalog Y
1937 Catalog Y
1936 Catalog X
1941 EH150 amplifier
1936 Catalog X
10" speaker
Tubes and controls
Inner label on base.
Inner label on side wall.

Label above is the Western Electric licensing agreement granted to Electrical Research Products, Inc., who also made amps for Oahu, Harmony, etc.