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In Reply to: RE: Which KT66? posted by Chip647 on April 08, 2015 at 19:50:27
Shape of the bottle, base construction
getter placement and mica supports
all contribute to the sonic attributes.
But look at the plate construction,
they are also different.
Let alone if they used different materials
and or gauges in their construction.
If they sound completely different,
how can they be the same?
I just don't see your case in evidence.
DanL
Follow Ups:
many of the original brown base power tubes were labeled low leakage bases and favored for the added extension to the highs.
Also the more powerful the tubes you will see ridged being molded between the pins, to lengthen any possible arc path.
The more fingers of mica, the less microphonic the tube. Or so J.C. Morrison told me early on when he became head designer for New Sensor. You can see this on early Genalex KT-77's, Earlier models have many fingers making contact with the glass later ones are more limited in number.
In the multi fingered micas, if you examine them carefully, the fingers alternate in length. Longer fingers crush against the glass for stability and the shorter ones serve as centering devices for the tube structure
Morrison informed me that the mica sheets have to have all perforations and shapes made with ONE pull of the die. This made complex shapes and perforations expensive to produce, because the dies would wear quickly relatively speaking. I'm sure now with laser etching readily available, things may have changed,.
Just dissected a Mullard xF2 which rolled off my desk and cracked. Interesting. Nothing too much different but the screen and grid support rods were all blackened. Haven't seen that in GE 6ca7's and such. Haven't compared it to regular EL 34's.
Some tubes use those beryllium bronze support rods, thought maybe that was for better conductivity, but Morrison told me it is done help dissipate heat better.
I'm sure there are many other factors that I am ignorant of.
"base construction getter placement and mica supports all contribute to the sonic attributes."
This would be an accident if remotely true. The manufacturers are obligated to produce a device that performs as the type it is as defined by the characteristics. IF a REAL sonic difference could be perceived or measured, then it would be attributable only to inter-electrode capacitances and the
micro differences thereof.
"base construction getter placement and mica supports all contribute to the sonic attributes."
This would be an accident if remotely true. The manufacturers are obligated to produce a device that performs as the type it is as defined by the characteristics. IF a REAL sonic difference could be perceived or measured, then it would be attributable only to inter-electrode capacitances and the
micro differences thereof.
Of course build quality and placement of insulators and type of bottle all affect the sonic nature of a tube. Just the way the bottle dissipates the heat has an affect on the sound as well as the components used.When tubes develop a vibration within the tube due to poor or lesser build quality,that translates to excessive microphonics which definitely changes the sound..So why wouldn't build type and placement have an affect?
You probably think that an entry level Goodyear shock absorber is going to give you the same ride and control that a Bilstein gas shock will just because Goodyear says this cheap shock meets OEM spec..Nothing could be further from the truth.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
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