![]() ![]() The lines and text are black instead of blue, and like the later run 'blue lines' use 6550 power vacuum tubes instead of 6146Bs. The second version of a vintage SVT is what is called the 'black line' SVT. ![]() The 6146B proved to be unstable in the high-voltage amp, and was switched to the more robust and reliable tube around mid-1970. These are called that because of the engraved blue text and lines that surround the tone controls.Įarly 1969-70 'blue lines' used. Types There are three types of original SVT amps. Later on Ampeg updated the speakers in the enclosures so that one cabinet was sufficient. The SVT head was initially used with a pair of sealed 8x10' because one cabinet could not handle the power of the SVT. The SVT has been through many design changes over the years but is still in production today. The SVT is a stand-alone amplifier or 'head' as opposed to a 'combo' unit comprising amp and speaker(s) in one cabinet, and was capable of 300 watts output at a time when most amplifiers could not exceed 100 watts output, making the SVT an important amp for bands playing and other large venues. The word 'valve' refers to the (called 'valves' in Britain and some other regions) used in the amp. The SVT, which stands for, was designed by Bill Hughes and introduced in 1969. Ampeg Svt Cabinet Serial Number Dating BrotherĪmpeg SVT VR 'Vintage Reissue' (blue line) The Ampeg SVT is a made. ![]()
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