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LAST 2 Quads
Matched Quad by Apex or Tube Amp Doctor. JJ Electronics superb 6550 rugged and durable. Superb 6550. Can be used in most KT88 applications. Especially great replacements for 6550s in older CJ amps, with high screen voltages. Superb Bass, Liquid mid range and sweet highs. Sextets available. Slovakia Made.