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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Your subject and your tagline posted by Lee of Omaha on February 2, 2015 at 08:24:24:
I would say mechanical build structure and materials used.We know that vacuum tubes are very subject to microphonics and that plays a major role in how the sound of a particular tube is perceived..Keep in mind that we are using output tubes for this test and in this particular amp they aren't amplifying any voltage but simply swinging it from the boot strapped driver stage.As I've said in another amp which uses a more conventional output stage,the results may be very different..I personally do not find major sonic differences in output tubes that others have claimed and the reason is,there isn't the high amplification factor going on in the output stage like their is in the voltage amp or preamp stage.For whatever reason,I love the black plate tubes in my amps but synergy plays a role as you have more or less stated.
" Emissivity is obvious; the higher the emissivity the lower the impedance. Interelectrode capacitance could affect highs, but really shouldn't be much of a factor in tetrodes and pentodes, especially at audio frequencies."
That is correct because we aren't dealing with miller capacitance issues because of the shielding but I do believe that all these things come together and can alter the sonic curve of one tube vs versus the other. I have several new old stock Genelex and GEC KT88s and every one of the quads sound different from the other.My Gold Monarchs sound different than the Gold Lions and the GEC and Genelex are different yet again..There is no real answer here and synergy plays an important role. I don't care for the British Genelex because on my equipment they tend to sound dry and lifeless on certain music.OTOH,some like that type of sound so I can't be the judge for them.I basically stated what I like in a tube or an amplifier and that is a sound that comes together as one.
Lee,do you remember when Bob Carver came out with his Amazing Speaker?
The speaker produced music just fine however you would hear mids and highs and then you would hear bass.The speaker couldn't blend the music as one.That's what I like about some tubes vs the other in that some blend the music as one better than the other does.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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Follow Ups
- Do you know or have an idea what causes various tubes to sound different? - Michael Samra 12:59:17 02/02/15 (0)
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