Comments on: What do the “O” and “H” stand for on my tube amplifier? http://audiograveyard.info/home-theater/what-do-the-o-and-h-stand-for-on-my-tube-amplifier All About vintage pro audio Fri, 20 Jul 2012 18:26:39 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Earth: The Connected Home http://audiograveyard.info/home-theater/what-do-the-o-and-h-stand-for-on-my-tube-amplifier#comment-854 Earth: The Connected Home Mon, 16 Nov 2009 16:01:29 +0000 http://audiograveyard.info/home-theater/what-do-the-o-and-h-stand-for-on-my-tube-amplifier#comment-854 If H is "hot" then I can't explain O. If O is "out" then I can't expain H. I'm stumped, and I spent some time on the webby looking for an answer too. I've been messing with this stuff since 1967 and have never seen those designations for positive and negative. If H is “hot” then I can’t explain O.
If O is “out” then I can’t expain H.

I’m stumped, and I spent some time on the webby looking for an answer too. I’ve been messing with this stuff since 1967 and have never seen those designations for positive and negative.

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