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1. [Amps] NOS 811's & 30L1 (score: 1): Author: "Mike Lord" <k4elv@bellsouth.net>; Date: Wed, 21 Sep 2011 14:25:23 -0500; I just completed the restoration of a 30L1, i.e., new Harbach board, "matched set" of 811's. Brought the unit up slowly with a Variac. 110 VAC line voltage, 1800 VDC unloaded on plates. All seemed ok; /archives//html/Amps/2011-09/msg00138.html (7,614 bytes)
2. Re: [Amps] NOS 811's & 30L1 (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Wed, 21 Sep 2011 15:49:59 -0400; Hi Mike, I wonder just exactly how those 811As were "matched" at source...? Years ago when I built my first HB kilowatt amplifier--using 4 surplus 811As--I learned the hard way of the importance of p; /archives//html/Amps/2011-09/msg00139.html (8,709 bytes)
3. Re: [Amps] NOS 811's & 30L1 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 21 Sep 2011 17:53:05 -0400; Praying _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-09/msg00140.html (8,774 bytes)
4. Re: [Amps] NOS 811's & 30L1 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 21 Sep 2011 21:17:32 -0400; If I recall the Johnson Viking 500 ran 2kV on the plates of the 811A modulator tubes. I don't think there were many reports of problems using the tubes available those days. 73 Bill wa4lav I just com; /archives//html/Amps/2011-09/msg00142.html (9,056 bytes)
5. Re: [Amps] NOS 811's & 30L1 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 21 Sep 2011 21:27:40 -0400; It used the same B+ on the plates of the 811As as the 4-250A final. 73 Bill wa4lav If I recall the Johnson Viking 500 ran 2kV on the plates of the 811A modulator tubes. I don't think there were many; /archives//html/Amps/2011-09/msg00143.html (9,794 bytes)
6. Re: [Amps] NOS 811's & 30L1 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 21 Sep 2011 21:55:17 -0400; With very few 500's sold you wouldnt hear much. Its still an excessive voltage but at least there are no parasitics. It also means the audio was excessive for the Class C stage unless the gain was ke; /archives//html/Amps/2011-09/msg00144.html (11,169 bytes)

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