This is a vintage 1972 Ampeg SVT ‘Blue Line’ bass guitar amplifier head. This particular example, serial number 112103, is in very excellent all original condition. This iconic bass amp remains unparalleled by all other vintage high-power bass amps, has been reissued by Ampeg to the tune of $2,000.00 and has achieved ultimate acclaim for virtually all applications. In short, when it comes to bass amplification, THIS. IS. IT.
Serial Number: 112103
Transformer Codes: 7221, 300712-1, 320829-1
Potentiometer Codes: 1377204
The Ampeg SVT utilizes; (6) 6550 (though the schematic reflects the earlier 6146) power tubes, (4) 12WD7, (2) 12BH7, (1) 12AX7, and (1) 6C4 tubes.
In 1969, Ampeg’s Chief Engineer Bill Hughes designed the Super Valve Technology circuitry for the amplifier of the same name. At 85 lb (39 kg), the Ampeg SVT provided 300 watts of RMS power, considerably more than most other bass amplifiers of the era. The high power rating made the SVT a candidate for use in larger venues. The SVT saw widespread use by rock acts in the 1970s, yet has since to wane in popularity.
This amp was serviced a short while ago, which included the installation of (2) replacement Mesa Boogie 6550 power tubes and a replacement polarity switch. Otherwise, the amp is all original and even includes original vintage 6550 power tubes. For an additional $75, I can install an original vintage plastic polarity switch to restore the panel to 100% original.