General views and a short overview of the amp as a whole can be found on this page. Below, a series of details to illustrate the preamp. Things of note: the "B" stamped at left on the aluminium upright, the coloured rubber sleeves to mark the signal from the two main channels (red for "Vibrato", yellow for "Normal", and blue for "Brilliant"); the general neatness of assembly; and the relative complexity of the reverb switch on the ancillary module.

Detail of OS/075. A four pole, 12-way switch.

Details of the preamp

Chassis number 11101. The flash of green paint at right indicates that Top Boost controls are integrated in the control panel.

A detail of the stamp "T B" for Top Boost.

Added sockets under the slider board.

Detail of the reverb tank and footswitch for "Vibrato" on/off.

Back to the page on Super Reverb Twins, 1965-1968.