12BZ7 Tubes

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I purchased a pair of RCA 12BZ7 black plate tubes from Ebay. The seller said they were a 12AX7 replacement. I don't want to use them in the preamp section of my integrated amp unless they are safe to use. Anyone know this tube. Sound characteristics? Thanks

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Topic - 12BZ7 Tubes - AudioSoul 12:39:04 06/21/16 (7)

RE: 12BZ7 Tubes - airtime 07:47:51 06/24/16 (0)

RE: 12BZ7 Tubes - AbeCollins 11:37:22 06/22/16 (0)

RE: 12BZ7 Tubes - Eli Duttman 13:32:43 06/21/16 (4)

RE: 12BZ7 Tubes - AudioSoul 14:13:26 06/21/16 (3)

RE: 12BZ7 Tubes - tubular.well 08:09:35 06/24/16 (0)

RE: 12BZ7 Tubes - hifipaul 16:19:55 06/21/16 (1)

RE: 12BZ7 Tubes - mcgjohn@yahoo.com 10:17:07 06/22/16 (0)

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