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Partial tube replacement in a pre amp


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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.

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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.

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