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Dating ampeg svt cl

The word "valve" refers to the vacuum tubes (called "valves" in Britain and some other regions) used in the amp.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 music festivals and other large venues.

Later 1970s models have the same features as the "black line" SVTs except the lines around the tone controls have rounded corners and curve into the tone controls.

They also came with 3-prong power cables, and no polarity switch.

The amp will produce roughly 225 watts , due to the screen voltage being too low.

As such, the power transformer of a 6146B SVT will be about 220V DC on the screen supply at idle instead of the typical 350V idle screen voltage normally seen on 6550 amps.

The second version of a vintage SVT is what is called the "black line" SVT.

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 early driver circuit was not properly designed, therefore would blow the 6146B tubes on occasion.

The reason most 6146 SVT amps blow tubes and resistors is due to front end 12BH7 voltage amplifier is being fed from the 430V node.

The SVT has been through many design changes over the years but is still in production today.

The SVT head was initially used with a pair of sealed 8x10" speaker enclosures because one cabinet could not handle the power of the SVT. These are called that because of the engraved blue text and lines that surround the tone controls.

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