Need schematic-H&K BATT preamp

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The Hughes & Kettner "B.A.T.T." bass preamp, discontinued in the mid-90s, is an all-tube, half-rack preamp/amplifier. Its five-watt power amplifier (EL84)will drive a speaker to practice levels.

Of particular note is the ability to take a line- or instrument-level signal from either the preamp or the power amp stages. Taking the signal from the power amp provides all of the output-transformer coloration that a tube amp has.

Harmony Central reviews are all good, so I thought I'd try to recreate it. Its fairly small, (about 12" square X 3" hi) and I thought with maybe a different output tube it would make a good 2X10 combo.
 
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