Re: Heater connection



"keithr" <keithr@xxxxxxxxxxxxxx> wrote in message
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"Iain Churches" <IainNG@xxxxxxxxxxx> wrote in message
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"Patrick Turner" <info@xxxxxxxxxxxxxxxxxx> wrote in message
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John Byrns wrote:

But then there are the people that like to run 12AX7s with 10V on the
heater.

Well yes, and they claim the sound becomes especially good
where with 12.6V it was not as special.

But perhaps temperature of the cathode is lower, hence noise is lower.
But then emission is lower so gm would be lower, increasing noise.

Tubes work with 10v instead of 12.6V. That's about all I know.


It is difficult to know if there really is anything in this.
People talk about running 6V3 heaters at 5V also.
They claim superior sound, but do not seem to be
able to qualify what they mean.

Does anyone have any experience of this? Any benefits
(other than perhaps longer heater life?)

Iain


Just more voodoo, they probably have volume controls that go to 11.

That's kid's stuff! I have a volume control that goes to 59:-)
It's a 60 position TKD attenuator. On the lowest position the
wiper is to ground, so I called that position "0" which makes the highest
pos 59.

The tubes will last longer though as long as the anode current isn't too
high, emission will be down a fraction

Yes indeed. But is there no magical improvement in the
sound which even the au pair can hear from the kitchen??

Regards
Iain



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