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1. [Amps] Re: Amps Digest, Vol 25, Issue 60 (score: 1): Author: John and Mary Powell <zl1bhq@paradise.net.nz>; Date: Mon, 24 Jan 2005 19:12:57 +1300; Carlos my late father, ZL1ACP re-tubed his 30L1 with 572B's without modification and the amp ran fine. He late sold it as re-tubed with no adverse comment from the purchaser. 73 John Powell. ZL1BHQ -; /archives//html/Amps/2005-01/msg00509.html (26,858 bytes)
2. [Amps] Re: Amps Digest, Vol 25, Issue 60 (score: 1): Author: "Joe Crawford" <crawfish@surfmore.net>; Date: Mon, 24 Jan 2005 00:30:01 -0600; Some amps biased the 811A's at -4.5 vdc. To run the 572B's, disconnect the bias and ground the pins. Reference WB2EGZ article in 73 back in 1966. You might want to short across input filter choke to; /archives//html/Amps/2005-01/msg00510.html (26,260 bytes)

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