The Grampian 636 is a rare British spring reverberator from the 1960s. It features two channels and can be used as a colourful preamp due to its Germanium transformers.

This is a rare British reverb unit from the 1960s infamously used by Pete Townshend with The Who as a guitar preamp during the 1966-67 period. No wonder he chose to do so; this germanium based unit adds a variety of exciting harmonic flavors to the guitar sound. I just wonder why this cool preamp is relatively still unknown among guitarists. I've used quite a few vintage tube and germanium mic preamps (RCA OP-6), echo units (Dynacord echocord, Echolette NG51, Binson echorec, Schaller echo sound), reverb units (Fender reverb unit) or treble boosters (Dallas Rangemaster, Dallas-Arbiter Treble-Bass Face) and I'd say that the Grampian unit is my favorite of them all. Depending on where the gain position is, it goes from warm/bottom-full guitar sound "that-is-just-starting-to-break-up-but-not-so-yet" to full blown screaming overdrive with cream on top. This is what most guitarists would call "magic dimension" to the tone. The Grampian 636 features two channels: Microphone with 2 inputs (balanced and unbalanced) & Auxiliary (500mV and 10mV). One output rated at 600ohm (1Volt) and a foot switch input for the reverb. All inputs are standard 1/4" jacks.

The Grampian 636 features two channels: Microphone with 2 inputs (balanced and unbalanced) & Auxiliary (500mV and 10mV). One output rated at 600ohm (1Volt) and a foot switch input for the reverb. All inputs are standard 1/4" jacks.

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