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In Reply to: National Union 813 Power Tubes posted by Phil D on September 24, 2007 at 17:49:14:
Phil, hi. The 813 indeed can be used for an AF amplifier - Class AB1 push-pull if you like. The 813 was a workhorse RF tube as well. National Union hasn't made tubes for decades. NU built righteous tubes although yours could just as easily have been OEM from RCA or Amperex or ...
I believe it was Shoreline out of the Sacramento CA area that made some mono amps that used quantities of these tubes in push-pull parallel to make monstrous power. In a way you can think of the 813 as a scaled up 807 beam power tube. These types are easier to drive than large triodes. Do some more Googling on Type 813. I can't remember if Sakuma has done anything with 813 but have a look at his work anyway. Have fun.
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Follow Ups
- RE: National Union 813 Power Tubes - elektron 09/24/0718:27:46 09/24/07 (8)
- RE: National Union 813 Power Tubes - MAS Tubes 18:16:37 09/25/07 (0)
- Did NU even survive WWII? - Frihed89 09:51:46 09/25/07 (6)
- RE: Did NU even survive WWII? - elektron 17:05:16 09/25/07 (5)
- Wasn't NU - unclestu52 17:46:17 09/25/07 (4)
- RE: Wasn't NU - elektron 23:09:29 09/25/07 (3)
- RE: Wasn't NU - P-90 02:02:33 10/9/07 (0)
- Thanks for the memory jog - unclestu52 12:24:56 09/26/07 (0)
- Thanks for the info - Frihed89 00:15:53 09/26/07 (0)