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Marshal 1959SLP Amplifier
Jimmy Page, Whole Lotta Love (theremin section),
HemisFair Arena, San Antonio, Texas, May 22, 1973
General Specs
Watts: 100 (Later 180)
Inputs: 4 Total (2 for each channel)
Features: Front Panel: On/Off Switch, Standby Switch, Presence, Bass, Middle, Treble, Volume, Volume. Rear Panel: Output Jack, Output Jack, Voltage Impedance Switch, Voltage Impedance Switch, Fuse, Fuse
Tubes: Power Amp: 4 x EL34, Pre-amp: 3 x ECC83
Dimensions & Weight: 12-1/4"H x 29-1/2"W x 8-1/4"D, 45 lbs.
Years in use: March 1969 - ca. 1998
Website: http://www.marshallamps.com/ 
First known stage appearance of Marshalls during Led Zeppelin was in March 1969. He would use one up through June 1969 along side the Arbiter 'Power One Hundred' and Vox UL-4120. After seeing basically no use the rest of 1969 and through 1970, a Marshall Super Lead finally shows up again in March 1971 and continues to do so through the rest of 1971 along side the Hiwatt Custom 100 Amplifier 'Jimmy Page'. The Marshalls in 1971 were likely being used for guitar at times and the theremin. February 1972 would be the official switch. Marshalls would become the main amps he used live from '72 through the end of Zeppelin and beyond and the setup he would basically become famous for. At least one of the heads, and possibly the #1 head (serial # A10053), is said to be an early to mid '69 head and formerly owned by Hendrix.

As far as studio use goes, he says he used one for the unaccompanied Heartbreaker solo and Bring It On Home. In a July 1986 Guitar World interview, engineer Eddie Kramer said that he believed that Page used a Marshall top for the Houses Of The Holy sessions at Stargroves in May 1972. Other than that, he really never mentions what studio work was done with a Marshall which leaves things open for plenty of speculation and arguing.

At least one of amps were modded at some point. There are loads of debates about the mods that reportedly took place to his Marshalls, what mods were done and when they actually happened. The most well known and debated is the heads being fitted with KT88s boosting the output to 200 watts. That all stems from a 1977 Guitar Player interview with Page where he was asked about his stage gear, he replys by saying "Marshall 100's which are customized by Tony Franks in New York (he also customized Hendrix's amps) so they're about 200 watts, KL88s or whatever they call them." Those were his exact words, he even said KL88s not KT88s, I think it's clear he meant KT88s though. Other mods ranging from simple tonestack tweaks, to the preamp being wired for more gain have been suggested over the years. It's often argued the change over to cleaner tones in '75 was the result of the KT88s. Others argue KT88s were there as early as the '73 US tour explaining the tones from that tour and most notably the Garden shows (TSRTS performance). It's hard to say what the cause some of the tonal changes are, simple volume/eq changes, recording gear, different speakers, etc... so many possibilities, there were definitely some slight tonal changes on stage though over the years. In a May 1986 Guitar World article, guitar technician Tim Marten said that the Marshall recently returned from the factory in England where new transformers were installed and the amp was boosted from its original 100 watts.

Marshall amplifiers were seen on the 1998 Page/Plant tour for use with the Custom Theremin.

Photos

Marshall 1959SLP Amplifier
Jimmy Page & John Bonham, March 15, 1969, Egegård Skole, Box 45 Teen Club, Gladsaxe, Denmark
Marshall 1959SLP Amplifier
Jimmy Page, Dazed And Confused, May 27, 1969, Boston Tea Party, Boston, Massachusetts
Marshall 1959SLP Amplifier
Robert Plant, June 22, 1972, Swing Auditorium, San Bernadino, California
Marshall 1959SLP Amplifier
Jimmy Page, ca. 1975
Marshall 1959SLP Amplifier
Led Zeppelin, July 03, 1980, Eisstadion am Friedrichspark, Mannheim, Germany
Marshall 1959SLP Amplifier
Tony Franklin, ca. 1985
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