Jennings Electronic Industries AC100
The AC100 was the third all-valve amplifier issued by Jennings, its precursors being (in order) the AC40 and AC15.
An early AC100 in standard Jennings cloth
A later amp in brown Jennings cloth
100 watt output. Two channels: bass and lead. The lead channel has volume, bass, mid, treble, and "bite" (preamp distortion) controls. The bass channel: volume, bass, treble, and boost. A master volume is provided far right. Four ECC83s serve the preamp, four EL34s in the power section.
A variety of speaker outputs are provided to allow for different impedances resulting from combinations of speaker cabinets. There is also a dedicated output for a slave amplifier.
So far as can be judged, it first appears in the Jennings range in 1972. In the list issued at the end of the year, its price is £130.
The pricelist of December 1972. The full list is available here.
Beat Instrumental, Jan. 1973, itemising Jennings prices.
The Jennings AC100 was not designed by Jennings, however, but by Triumph Electronics - more precisely, by Dave Roffey who worked for Triumph. It was first put into production by Vamp, for whom Dave subsequently worked. In early 1972 Johnson Amplification, owned by Geoff Johnson (who also owned Triumph), adopted the design; then at the end of '72 it was marketed, with appropriate change of logo, by Jennings.
Beat Instrumental magazine, April 1972. The 100W Universal Amplifier later sold by Jennings.
Jennings presumably did not manufacture the amp, but contracted Triumph to do so (much as Vox had contracted Triumph in the 1960s).