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1. [Amps] The quality of Chinese 811A and 572B (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Fri, 14 Nov 2008 11:20:42 +0800; Hello ,Guys! When I became a ham operator in 1992, I often heard some complaint about the quality of Chinese 811A and 572B.Yeasterday, My friend and I call the manufactorer and talk with the engineer; /archives//html/Amps/2008-11/msg00154.html (7,130 bytes)
2. Re: [Amps] The quality of Chinese 811A and 572B (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 14 Nov 2008 11:15:02 +0000 (GMT); Hi Hsu I hope this helps: A "good" report": I used a pair of Chinese 572Bs in restoring a Heathkit SB200 for a friend. They worked extremely well, gave matching currents and full output as per s; /archives//html/Amps/2008-11/msg00155.html (9,977 bytes)
3. Re: [Amps] The quality of Chinese 811A and 572B (score: 1): Author: "Chuck Lewis" <n4nm@knology.net>; Date: Fri, 14 Nov 2008 10:01:45 -0600; I wonder how long ago those RF Parts 3-500Zs were manufactured. RF Parts, on their website, acknowledges quality control issues that existed several years ago, but claims to have narrowed their sourc; /archives//html/Amps/2008-11/msg00157.html (13,037 bytes)
4. Re: [Amps] The quality of Chinese 811A and 572B (score: 1): Author: Kees - pa7two <pa7two@hotmail.com>; Date: Fri, 14 Nov 2008 18:30:14 +0000; Dear all, I repaired 9 FL2100B/F/Z amplifiers in total . As Cetrons are hard to get and most of all extremely expensive AND 30 years old (gassy), I took the China brand 572B tubes as replacement. Out; /archives//html/Amps/2008-11/msg00158.html (15,709 bytes)

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