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14-Mar-2018 15:25

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.

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

The 6550A version of SVT amps tends to have a more rounder deeper bass sound..

Mainly due to the output transformer primary inductance with respect to plate resistance..

In the event of a tube short failure or simply a transient overload condition the diode will conduct once the current in the 22ohm screen resistor reaches 30m A and beyond, preventing further burning of the PCBA.

The diode will clamp the current in the 22ohm screen resistor to 30m A, so preferably the plate resistor will blow...since the plate resistor is acting as a "fuse".

was designed by Bill Hughes and introduced in 1969.

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

another reason the 6146 amps have more growl than its 6550 counterpart is because the pre-amp is turned up a bit higher to achieve the equivalent power output swing, thus more "grind" (fuzz bass) can be obtained from the preamp.Sweetwater's Sales Engineers are regarded as the most experienced and knowledgeable professionals in the music industry, with extensive music backgrounds and intense training on the latest products and technologies.They are available to offer you personalized product advice any time you need it.The 6146B tube in itself does not have instability issues and is a reliable tube.

The early driver circuit was not properly designed, therefore would blow the 6146B tubes on occasion.The 6550A version usually idles with roughly 700V DC on the plate and 350V DC on the Screens...during full clean sine wave 300W power output, operating voltages will dip to roughly 650V DC on the Plate and 325V on the Screens.The Output Transformer plate load is 1.6K at 4 Ohm tap and 1.75K at the 2 Ohm tap.The 6146B proved to be unstable in the high-voltage amp, and was switched to the more robust and reliable 6550 tube around mid-1970.