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In Reply to: RE: tube cooler posted by wkhanna on November 15, 2014 at 07:20:21
Try PEARL coolers. IIRC, Parts Connection carries them . I solder a wire and ground them for better performance
Follow Ups:
Thanks for the feedback, Stu.Funny thing.....after a lot searching/researching on my own, I was looking at the Pearl H/S's.
Just placed my order with PC.
I don't have hum issues.....is there any other reason for grounding?
----------------------------
Practicing Curmudgeon & Audio Snob
......just an 'ON' switch, Please!
Edits: 11/15/14
PEARL coolers are blackened copper. Gotta file a portion to base matal for solder to stick.
simply sliding coolers on will induce.a.slight roll off on top end. Grounding cooler.will restore most of that top end.
"simply sliding coolers on will induce.a.slight roll off on top end. Grounding cooler.will restore most of that top end.
"
Can you give a technical explanation for that?
Logic would argue the opposite.
Any capacitance between the tube and the tube cooler would not cause a loss of high frequencies unless the tube cooler is grounded.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Out of curiousity have you tried the PEARL coolers? The effect is quite audible, and incidentally was also commented about in a Chinese audio journal. That reviewer.simply.pushed the coolers against the chassis to regain the highs.
I noticed the effect when a simple touch increased the highs if only for a short time. I figured my body was grounding the coolers.
you have no technical explanation?
Thanks anyway.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
between the plate of a 12ax7 and a tight fitting metal tube shield at 2pF.
That's not enough capacitance to make any audible difference.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
alex`statement is not quite correct. he forgot the influnece of radiation. not only the radiation through the vacuum heats the glass around but also the hot glass bulb radiates a part of the heat backwards to the anode and occures a higher temperature there than possible with cooler glass. so cooling the bulbs surely influences the balance of temperature.
BTW: in a tube is a relative bad vacuum. you would find more gas left as you perhaps assume...
N.
The times, they are changing...
The temperature of some tubes that run hot is so high that adding "fins" is not going to cause a statistically significant decrease in temperature. If the temperature is 130 or more degrees, how cooler is it going to be once you add some (basically) fins? Is such a decrease in glass temperature going to radiate less back to the anode? I don't think that's relevant.On the opposite case, with rather cold operated tubes, the effect is obviously even lower and less statistically relevant.
Let's not open the Pandora jar of the radiation vs convection and whether a colder object can radiate (and relevantly influence) towards a much warmer (hotter, in this case) object?
Last but not least, temperature is the least relevant factor in limiting the operating life of small signal tubes, like the 6922 (ECC88). Even heaters voltage is a much more relevant factor. Besides, what is the hours count for average users per annum? 3 hours average per day gets you to maybe 1000 hours per year... at 3000 hours life expectancy, that's 3 years, at least. By that time you should be replacing the electrolytes in your preamp as well, but less than 1% of users are going to replace the electrolytic caps.
Even the operating life of tubes seems to be a rather consumerist story, with lots of sales possibilities for dealers and services...
******
http://rh-amps.blogspot.com/
Edits: 11/16/14
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