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85.141.96.66
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.
Tubers,
How did you come up with the date for the TS? If you used the code you supplied, it is incorrect. That is not a date code but the supply system FSN = Federal Stock Number, later to become the NSN.
Should be a marking on the TS of 322xxxx. 4th and 5th digit should generally be the year of manu.
jstrm
Then I was wrong, but the box says: DATE PKD. 4/61
OK. I kinda figured there would be a real date somewhere on the tube or box. Just thru me a bit when the last 2 numbers of the FSN matched the date you said they were manu.
GTG!
jstrm
1980's Sylvania 5881 are electrically compatable but that is where the story ends as they are rebadged Philips US 6L6WGB - a pretty strong tube - but not terribly distinguished sonically. Those 1960's Tungsol 6L6WGB are true Tungsol 5881's, sonically excellent - they called them 6L6WGB for military ordering purposes.
One thing to note - the Philips 1980's 6L6WGB is under-rated electirically - it can handle a lot more than typical 5881 voltages. So if you have an amp that is really designed for a 6L6GC, or pushes the GB spec to the limits, it may be wiser to stick with the Philips mage GB's or seek out good 6L6GC's.
Yes. Though the manufacturer does not object against TS tubes, I suspect that Sylvania/Philips tubes and the stock big bottle Shuguang 5881 tubes are more robust than the TS, which might have been a reason for the blown fuse. Manually biased amps are much safer in this respect.
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