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Old 17th November 2004, 06:15 AM   #1
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Default suggestions for the "lowest noise" pentode

hi,

As per usual, in need of some suggestions from some of the more experienced folk here.

I was wondering what would be the candidate for the lowest noise pentode?

Mullard used to hold up the EF86 as such a device. And indeed it's good by pentode standards, but a 6BR7 is even quieter.

Anyone got any suggestions that could top that (a 6BR7)?

Given the calibre of my tube knowledge, I'm sure there's another one out there that must be lower still.
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Old 17th November 2004, 07:37 AM   #2
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How about the Mullard EF37A? Like a super premium 6J7 as I understand it. Quad used them as input stages in their amps long ago.
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Old 17th November 2004, 11:22 AM   #3
EC8010 is offline EC8010  United Kingdom
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Take a look at 6BS7, in particular, look at the last two pages of the Brimar data sheet (available on Frank's site).

BTW The regulated heater supply is frighteningly bad!
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Old 17th November 2004, 11:29 AM   #4
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Don't overlook some of the bigger ones (like 6BQ5) running full-tilt Pa either
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Old 17th November 2004, 07:33 PM   #5
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Old 17th November 2004, 10:08 PM   #6
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Hello ,

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Old 1st December 2004, 09:42 AM   #7
Mike C is offline Mike C  United Kingdom
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Very low noise figures.
Said to be lower noise (as pentode!) than most ECC8* series.

I use them successfully in a phono stage; how much lower noise than that do you want?
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