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The first Pignose amplifier was a battery-powered, five-watt portable guitar amplifier with one five-inch speaker. It is considered the first portable electric guitar amplifier. The inventors gave 65 prototypes (with rubber volume knobs shaped like the end of a pig's nose) to some of the most famous musicians of the era, including Led Zeppelin, The Rolling Stones, The Beatles, The Eagles, and The Who . Terry Kath (of Chicago) was given one which led to a partnership with the group and its management team in 1972.
The first production Pignose model was debuted publicly at the 1973 NAMM Convention in Chicago. Now known as the "Legendary 7-100," the amplifier is still in production and used primarily as a portable practice amp. It has also found a role in recording studios, having been used on records by Joe Walsh, Eric Clapton and Frank Zappa.
The 7-100 includes hanger buttons for a guitar strap, allowing a musician to carry the amplifier while standing or walking. The 7-100 is powered by six AA batteries or an optional AC adapter and weighs between five and six pounds (2.27-2.72 kg). Another feature is the hinged case design, allowing the user not only to store objects like the cable and strap inside the amp, but also to open the case slightly to alter the tone to their preference . A feature for the more serious musician is the preamplifier output jack on the rear, allowing it to be connected to a larger amplifier for use as a guitar distortion effect .
In addition to the 7-100, the company offers two battery-powered portable models called "Hog" that use integral rechargeable batteries, as well as small solid-state amplifiers.