The 2 gain, 4 EQ and 3 Master Gain pots were individually unsoldered from the Tubeman Plus PCB. Since proper cleaning was not possible while the pots are mounted on the PCB the following was performed. Most of the control pots were scratchy so cleaning was required. Here is a list of the mods performed on this preamplifier to increase it's functionality. just a filler panel on the rear of the chassis. The unit did not have the optional MSM-1 Control board for MIDI Control.Because of some scratchy pots, the owner had used copious amounts of greasy contact cleaner that was leaking out of the chassis.This particular unit had a few problems when I received it. This preamplifier uses a single 12AX7A preamp tube. The is a shared gain for Clean/ Crunch and a separate gain for the Lead channel which also has a switch to revoice the preamp for a LEAD 2 sound. It is a 3 channel amplifier with independant Master Volume controls for each channel and shared EQ controls. The H&K Tubeman Plus Rack Preamp (circa 1993) is a tube guitar preamplifier with optional MIDI controlability.
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