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PG's Joe Coffey is On Location at the 2009 New York Amp Show where he visits the Goodsell Amps booth. In this video segment, we get our first look and sample of Goodsell's Black Dog 20 head. The Black Dog 20 is a close relative of the original Super 17 and features a pair of 7189A output tubes and 2-12AX7 preamp tubes. Also, it typically runs plate voltages around 385-400vdc and is completely cathode-biased.