Sylvania 5881 vs TungSol JAN-CTL 6L6WGB

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Are these tubes electrically similar? TS tubes are manufactured in 1961 (code 5960-262-0161) and Sylvania 5881 tubes in the 80es (code 8026 ADG 34167). As far as I know, the TS tubes have a rated anode dissipation of 23 watts and maximum anode voltage of 360V, but I don't know Sylvanias' characteristics. With an auto-biased amp, is it safe to replace Sylvania 5881 tubes with vintage TungSol tubes? I did it once bit one TS tube produced an arc and one fuse blew. The manufacturer claims that it would be safe to use TS tubes if they are OK. Unfortunately, I don't have a tester to check the TungSol tubes.

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Topic - Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - tubers 13:15:23 07/01/09 (5)

RE: Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - JSTRM 08:28:06 07/02/09 (2)

RE: Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - tubers 13:46:22 07/02/09 (1)

RE: Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - JSTRM 21:54:31 07/02/09 (0)

RE: Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - astralnavigator 06:08:46 07/02/09 (1)

RE: Sylvania 5881 vs TungSol JAN-CTL 6L6WGB - tubers 13:51:38 07/02/09 (0)

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