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The very first 100 watt amp produced by Marshall.... sometimes called the "Super Amplifier" was a doubled up version of his first amp, the JTM45. Apparently Jim wanted an amp with 2x the volume so he made the JTM45/100, a JTM45 with two separate power sections powered by KT66s and built a 8x12 Cabinet to go with it filled with early Celestion Alnico 15 watt speaker.
Captured thru a R121 and SM545 mining up a 69 Marshall 4x12 with T1221 G12M25 Greenbacks and (X) Celestion 15 watt alnico reissues.
Key:
N - Normal
B - Bright
J - Jumpered
X - Celestion Alnico