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Ampeg B25B Amplifier
John Paul Jones, August 16, 1969, Asbury Park Convention Hall, Asbury Park, New Jersey
General Specs
Amplifier
Watts: 55 Watts RMS, 120 Watts Peak
Inputs: 4
Features: Front Panel: (2) Bright Input Jacks, (2) Normal Input Jacks, Channel One Volume, Bass, Treble, Channel Two Volume, Bass, Treble, Standby Switch, Polarity Switch, On/Off Switch - Rear Panel: Fuse, Non-Polarized AC Outlet, External Amp Jack, (2) External Speaker Jacks, Ground Switch
Dimensions: 10"H x 23 1/2"W x 10"D
Cabinet
Speakers: (2) 15" Altec Lansing (16 Ohm)
Tubes: Power: 2 x 7027A, Preamp: 1 x 12DW7, 2 x 12AX7
Dimensions: 40"H x 29"W x 12"D
Total Weight: 132 lbs.
Years in use: August 16, 1969
Website: http://www.ampeg.com/ 
This amplifier and cabinet was most likely borrowed (perhaps from the bass player of the supporting act, Joe Cocker) for this date.

An Ampeg B-25 Cabinet made a one-off appearance on October 09, 1972.

Photos

Ampeg B-25B
Ampeg Amplification 1971 Catalog, Page 5
Ampeg B-25B
John Paul Jones, August 16, 1969, Asbury Park Convention Hall, Asbury Park, New Jersey
Ampeg B-25B
Led Zeppelin, October 09, 1972, Osaka Festival Hall, Osaka, Japan
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