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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Thanks for that information... posted by Lew on May 25, 2022 at 09:13:26:
If it is only 100C then I would not worry too much - it is a different situation when the tube is running at maximum dissipation andthe glass temperature gets around the 220C.
It has to do with the Kelvin temperature of the cathode which should stay within a narrow band. Cannot remember where I read all the details otherwise I would point you in that direction.
But for rare and/or expensive tubes it may be worthwhile to use. I am having a pair of EL506 (the last iteration of the 7868 with half the distortion of the 7868/7591) and good luck finding a pair of those. I've 4 four pairs of 7868, two pair are NOS the others I don't know. But the 7868 are Novar whereas the EL506 are Magnoval so it means a socket change if one of the EL506 goes belly-up.
I'm using slow ramp up of the filament and then slow ramp up of B+, every hour extra that I can squeeze out helps. Same as that I am running my amplifier at design ratings and not at absolute ratings what many manufacturers do (and shorten tube life).
I've also stocked up with the 12AT7 driver: got five NOS Telefunken ECC81's and three NOS Brimar E81CC. Fortunately all bought before the short supply of new tubes.
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Follow Ups
- RE: Thanks for that information... - 7868 11:32:56 05/25/22 (3)
- Are the Pearl coolers elasticized? - Lew 07:58:50 05/26/22 (2)
- the Pearl coolers will fit different diameters - 7868 15:36:01 05/26/22 (0)
- RE: Are the Pearl coolers elasticized? - 2chblast 08:27:52 05/26/22 (0)
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