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Old 28th November 2009, 05:37 PM   #1
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Default Which tubes are lowest noise?

Which dual triodes, Octal or 9 pin, are considered lowest noise and microphonics? I know that noise and microphonics varies with individual tubes of the same type, so my question is about what's typical to various types. The tubes are to be used in MC phono stage, MM phono stage and pre-amp.
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Old 28th November 2009, 08:49 PM   #2
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I think the ECC88 (E88CC, ECC188, 6N23P ... )family is one of the lowest noise dual triodes.
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Old 28th November 2009, 08:54 PM   #3
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Which are you planning tp use?ECC83,81 ?
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Old 28th November 2009, 09:06 PM   #4
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Quote:
Originally Posted by Panicos K View Post
Which are you planning tp use?ECC83,81 ?
I consider designing according to the tubes chosen. I'd like to start with those known having lowest noise and microphonics. Of course, the gain factor is also a consideration, for higher gain may compensate for lower noise.

So, actually, my question should be about tubes with best noise to gain ratio.
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Old 28th November 2009, 09:10 PM   #5
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I use ECC83's in my pre amps.

The valve isnt the only source of noise, great care should be taken with routing of wires and power supply configuration. I always use DC heater supplies too.


I noticed with the valve in a none screened case that it picked up radiated emissions quite badly.
A good earthed metal box does the trick.
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Old 28th November 2009, 09:14 PM   #6
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In a friend's mm/mc preamp(project) lowest noise from some ECC83 we tried,surprisingly was a nos Hitachi 7025.Of the new versions the sed winged-c 12ax7 was very good.He ended with both plus a third pair of brimars.Best sounding was the brimars,but we haven't tried all.
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Old 28th November 2009, 09:18 PM   #7
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Quote:
Originally Posted by nigelwright7557 View Post
The valve isnt the only source of noise, great care should be taken with routing of wires and power supply configuration. I always use DC heater supplies too.


I noticed with the valve in a none screened case that it picked up radiated emissions quite badly.
A good earthed metal box does the trick.

The above goes without saying, or should be obvious. Yet, tubes noise, or noise to amplification ratio, should be considered as well.
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Old 28th November 2009, 09:20 PM   #8
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Quote:
Originally Posted by Panicos K View Post
In a friend's mm/mc preamp(project) lowest noise from some ECC83 we tried,surprisingly was a nos Hitachi 7025.Of the new versions the sed winged-c 12ax7 was very good.He ended with both plus a third pair of brimars.Best sounding was the brimars,but we haven't tried all.
Any availability of those Hitachi NOS?
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Old 28th November 2009, 09:55 PM   #9
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lowest noise from some ECC83 we tried,surprisingly was a nos Hitachi 7025
why is that surprising? The 7025 is supposed to be a low noise industrial version of the ecc83.
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Old 28th November 2009, 10:08 PM   #10
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Originally Posted by ErikdeBest View Post
why is that surprising? The 7025 is supposed to be a low noise industrial version of the ecc83.
I know,more surprising was the Hitachi,not the 7025
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