zuzu Posted March 7, 2007 Share Posted March 7, 2007 My Sp 11 has six 6dj8 tubes that do 'NOT', need to be matched or low noise. They have been in for about 15 years. I would guess they have about 4000 to 6000 hours on them. The manual says they should last 5000 to 10,000 hours, They still sound great but I'm ordering new ones anyway. The new ones will be all the same manufacturer [sylvania] and be $20 or less. I discovered it's a bit difficult finding 6 of the same tube. Should I buy more than 6, if I can, in case one or two of the new tubes go bad before the others so I can replace them rather than need all 6 again? Thanks. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted March 7, 2007 Share Posted March 7, 2007 You have your old ones, which are still good as spares. If you replace early again, sell off your first set of spares, and just keep the recent set. You should be able to sell the used working tubes for 1/3 - 1/2 of the new tube cost. Quote Link to comment Share on other sites More sharing options...
zuzu Posted March 7, 2007 Author Share Posted March 7, 2007 The reason I was asking this was Dale [the audio specialist] at www.vacuumtubes.net said he would not mix manufacturers. I have no idea at present what tubes are in the SP 11 now. I guess you both do not think manufacturer mixing matters, Quote Link to comment Share on other sites More sharing options...
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