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1. [Amps] SB220 running plate current when no drive (score: 1): Author: Steve AA7V <aa7victor@gmail.com>; Date: Mon, 5 Oct 2020 11:03:30 -0700; Hello to the group; My SB220 has started to act up. Immediately upon power on, the 3-500s both start drawing plate current. The meter shows approximately 250 ma of current. It is apparent some compon; /archives//html/Amps/2020-10/msg00001.html (6,987 bytes)
2. Re: [Amps] SB220 running plate current when no drive (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Mon, 5 Oct 2020 21:03:52 +0000 (UTC); Hi Steve: I am pretty sure you are the proud owner of at least one tube with a grid to cathode short. Since the filaments are wired in parallel, you can remove (carefully) one tube at a time, and see; /archives//html/Amps/2020-10/msg00002.html (9,003 bytes)
3. Re: [Amps] SB220 running plate current when no drive (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Tue, 6 Oct 2020 08:56:31 +0800; Grid to filament short in one or both tubes. 73, Alek, VK6APK My SB220 has started to act up. Immediately upon power on, the 3-500s both start drawing plate current. The meter shows approximately 250; /archives//html/Amps/2020-10/msg00003.html (7,835 bytes)

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