Don't forget to add pope's blessing before starting this procedure. Sometimes helps.
KUHL tube treatment - is this black smoke????
So i was told that Kuhl treatment of a tube and for me a 396a JW 2c51 tube.. would be a worthy enhancement ...
What do you guys think?
{ quoted from TUBEWORLD ]
In stock form, a typical electron tube exhibits several problems that directly impact its sonic performance. Most serious are the many internal stresses in the construction materials that accumulate during most of the stages of manufacture and a very hard, heavy oxide-coating on through-glass pins to which direct connection is made. Seven (7) and nine (9) pin miniature tubes are typical of those pins that are heavily oxidized while power tubes such as KT88 and EL34 are fitted with bases whose pins are tinned with the result that contact quality is much improved. During cryogenic tempering, the tube is slowly cooled to the -193°C / -320°F temperature of liquid nitrogen (LN2), "soaked" for 36 hours, then slowly returned to ambient temperature.
By means of this unique and vital process, the stresses interior to the materials of the tube are substantially and permanently relaxed. The "Q" of the (self) resonant (electro) mechanical systems responsible for the output of (self) microphonic spuriae is thereby drastically reduced. By this important reduction, both the peak amplitude and the "ring down" time of these systems is reduced with the result that the "apparent gain" of the tube is increased - even in feedback controlled circuits - while the "dynamic noise floor" is lowered.
The sonic improvements of a over a "factory condition" NOS tube include:
tighter focus from top to bottom
more holographic 3D soundstage
more subtle inner resolution extracted from recordings
tighter bass
increased dynamic range
faster transient response
clearer vocals
What do you guys think?
{ quoted from TUBEWORLD ]
In stock form, a typical electron tube exhibits several problems that directly impact its sonic performance. Most serious are the many internal stresses in the construction materials that accumulate during most of the stages of manufacture and a very hard, heavy oxide-coating on through-glass pins to which direct connection is made. Seven (7) and nine (9) pin miniature tubes are typical of those pins that are heavily oxidized while power tubes such as KT88 and EL34 are fitted with bases whose pins are tinned with the result that contact quality is much improved. During cryogenic tempering, the tube is slowly cooled to the -193°C / -320°F temperature of liquid nitrogen (LN2), "soaked" for 36 hours, then slowly returned to ambient temperature.
By means of this unique and vital process, the stresses interior to the materials of the tube are substantially and permanently relaxed. The "Q" of the (self) resonant (electro) mechanical systems responsible for the output of (self) microphonic spuriae is thereby drastically reduced. By this important reduction, both the peak amplitude and the "ring down" time of these systems is reduced with the result that the "apparent gain" of the tube is increased - even in feedback controlled circuits - while the "dynamic noise floor" is lowered.
The sonic improvements of a over a "factory condition" NOS tube include:
tighter focus from top to bottom
more holographic 3D soundstage
more subtle inner resolution extracted from recordings
tighter bass
increased dynamic range
faster transient response
clearer vocals
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