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The exact wiring for this mod is unknown. David plugged into the High sensitivity Brilliant input.

The Brilliant volume pot was removed and the Normal inputs were taped over.

These were modified so both the Normal and Brilliant channels were linked internally to the normal volume pot. In the early days of Pink Floyd, from 1969 to Summer 1974, Gilmour used Hiwatt DR103 AP (all purpose) model 100w amps, made for him with "Pink Floyd" engraved on the faceplate (all had AP in the serial number). This causes no harm at all to the amp and allows for more more tonal options when both channels are running at the same time. Linking two channels allows a parallel (not stacked) blend of both channels simultaneously. Guitarists have been linking the input channels together on these four-input amps since the beginning, including Gilmour. The four inputs on a Hiwatt DR103 or Reeves Custom 50/Custom 100 Most four-input Hiwatts have the reverse, low sensitivity inputs on top and high on the bottom. Four-input Marshalls typically have the high sensitivity (high gain) inputs at the top and low sensitivity (low gain) inputs at the bottom. There is no right or wrong, it's just a matter of which input sounds best to you. If you have a weak output pickup it may sound best through the high inputs.

If you have high output Strat pickup or Humbucker pickup, it may sound best and tamer through the low inputs. The high sensitivity inputs are a bit hotter sounding and the low are a bit mellower sounding. Each channel had a high sensitivty input and a low sensititvity input. This was originally intended to allow more than one instrument to be plugged into the same amp.

Usually two inputs go to one channel and two to another. LINKED INPUTS - Many high powered Marshall, Fender and Hiwatt amps have four inputs.