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It doesn't look as if anyone ever worked on this amp since it left the factory... The twin 6CA7 power tubes are RCA from the UK while 5 of the 6 pre tubes have the Rogers moniker stenciled on them. Production dates were 1968 to 1973, so this was a fairly early amp. As you can see by the chassis images, all wiring and components look original... Potentiometer dates are 6837 x 5 pots and 6825 x 2 pots. The amp likely went out the door in late Fall or early Winter 1968...

SVTs of this era had volume, treble, midrange, and bass knobs for the first channel, while channel 2 only had volume, treble, and bass.

Extra flexibility came via the five rocker switches along top, which engage ultra-hi and ultra-lo boosts for each channel, and a 3-position mid-tone control. tour, their first since 1966, was the group’s seminal run in American arenas—up until then they’d been playing smaller theaters and auditoriums.

Gear-wise, 1969 was the birth of Ampeg’s SVT amplifier—the backline choice not just for bassist Bill Wyman, but also for Mick and Keith Richards during the band’s 1969 U. A year later, the 6146s were switched out for more reliable 6550s.

The earliest “blue-line” SVTs like the one shown here (which has since been updated with KT88 tubes) had control panels engraved with blue lines and text, though Ampeg later switched to a more legible black format.

These amps produced the defining sounds of rock ‘n roll, and as such are highly valued today.

While modern solid state amplifiers have many advantages in terms of size, weight, and cost, the vacuum tubes used in vintage guitar amps produce an unmistakable warm, fat tone, and rich organic distortion.

For the Rolling Stones, however, it was a tumultuous year of firsts and lasts.

It was the last year Brian Jones contributed to a Stones album (two tracks on 1969’s last year of the Altamont Speedway Free Festival—which was headlined and organized by the Stones, and billed as “Woodstock West.” Sadly, it’s primarily remembered for its fatalities, including the infamous scuffle between a Hells Angel and a murderous meth user. Ampeg’s Bill Hughes and Roger Cox designed the “Super Vacuum Tube” amps with help from Bob Rufkahr and Dan Armstrong. The 95-pound, 2-channel, 300-watt head was originally loaded with 14 tubes, including six large, volatile 6146 power tubes.

Production models weren’t out yet and backup rigs weren’t an option, so Ampeg’s Rich Mandella joined the tour as the official SVT babysitter.

The electric guitar may be the iconic symbol of the rock ‘n roll era, but it was the guitar amplifier which allowed bands to turn it up like never before.

That sound, which is different than the clean tone of transistor amps, is why vintage tube amps are so sought after today.

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