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1. [AMPS] Penta PL-175A (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 25 Mar 98 22:13:46 -0600; Howdy all, I have a couple of Penta PL-175As that were pulled from an old Johnson-Viking Invader. Is this tube a replacement for the 3-500z? It sure looks a lot like it. If not, can someone point me; /archives//html/Amps/1998-03/msg00425.html (6,994 bytes)
2. [AMPS] Penta PL-175A (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Thu, 26 Mar 1998 09:16:30 EST; It is a pentode version of the 4-400A Jon; in use it was a direct swap for the 4-400A by just grounding the suppressor grid. Its claim to fame was a slight bit more output. The Invader came with 4-40; /archives//html/Amps/1998-03/msg00428.html (7,648 bytes)

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