
	Where results make sense

Topic: Valve sound

	Auscultation of the Heart
		Although simultaneous motion of the mitral valve is not shown in figure 199c, subsequent investigations using cineradiography and echocardiographic techniques to visualize the mitral valve during variations of the PR interval have further confirmed the relationship between the rate of mitral valve closure and the intensity of M1.
		As shown in the left panel of figure 199i, the aortic valvular ejection sound is delayed 20 to 40 msec after the onset of pressure rise in the central aorta and is coincident with the sharp anacrotic notch on the upstroke of the aortic pressure curve.
		Sound and motion correlates identical to those demonstrated by cineoangiography have been found with phonoechocardiography, clearly showing the onset of ejection sound to be coincident with the maximum opening of the valve (figure199j).
	www.rjmatthewsmd.com /Definitions/auscultation_of_theheart.htm (8992 words)

	Valve sound
		Valve sound refers to the characteristic sound of music amplified by a valve amplifier[?], generally believed to be generated by the addition of second harmonic distortion from the triode characteristic of its valves.
		The sound is generally considered "warmer" than the sound produced by transistor amplifiers.
		Transistor amplifiers or DSP algorithms can approximate a valve sound by adding square law distortion, approximating the effect of the triode characteristic of the original valve amplifiers.
	www.ebroadcast.com.au /lookup/encyclopedia/va/Valve_sound.html (105 words)

	4. Calculating the noise emission
		The high sound emission from control valves which sometimes occurs with certain operating conditions results from the internal flow procedures which generate the fluid sound in the form of pressure and velocity pulses in the flowing medium (Flow conditions with control valves).
		Now the throttling point of a control valve is not a "circular hole" so you will also need a valve style correction factor which depends on the geometric shape of the plug and of the valve and of the valve body and on the valve position.
		All sound calculations with control valves have this condition as a basis because as a rule the reflection conditions in the space and in the pipeline are unknown.
	www.haison.com.vn /Ebooks/Control_Valve/4__Calcu.htm (3800 words)

	Valve sound - Definition, explanation
		The valve sound or tube sound is the sound often associated with music amplified by a valve amplifier, although this association is not strict.
		The valve sound is often described as being "warm", "rich", "relaxed" etc., in contrast to a so-called transistor sound that is sometimes said to be "faster" or even "harsh" and "brittle".
		Another aspect of the valve sound is that early valve amplifiers often had only limited bandwidth, in part due to passive component technology available at the time, notably capacitors.
	www.calsky.com /lexikon/en/txt/v/va/valve_sound.php (882 words)

	Sound Performance Lab . Charisma 2 . SPL CHARISMA DUAL CHANNEL
		The valve's behaviour is governed by the Drive and Charisma controls: the Drive control adjusts the level of the signal fed into the valve stage by up to +24dB, and the Charisma control varies the valve's saturation characteristics.
		As Drive is increased, the valve starts to operate in its non-linear region, but because valves saturate softly, rather than clipping in the way that most transistor circuits do, the effect is to add subjectively musical harmonics, while at the same time restricting the dynamic range by compressing individual waveform peaks.
		Original valve mics were designed to be as clean as possible, not to deliberately distort the sound, so with most vintage gear you don't get significant amounts of distortion until signal levels are very high.
	www.soundperformancelab.com /Charisma2/T_UK_SOUND0ON0SOUND_D.html (1308 words)

	Drawmer - Happiness is a Warm Valve...
		They mangle the sound in a pleasant way so everyone from axe-fondling guitarists to anal-retentive studio engineers think valves are just the thing for the added warmth, grit and dirt needed to humanise the super-clean digital mixes that modern gear produces.
		Valves rely on the peculiar properties of clouds of electrons in a vacuum being pulled around by an electronic field applied to a metal grid.
		If you like the sound of a certain mixer brand but need the features of a big desk, it may even be worth spending a couple of hundred quid on a tiny submixer just to process a complete mix before you master it to tape.
	www.drawmer.com /help2.html (2494 words)

	Facts about valve sound (Site not responding. Last check: 2007-11-01)
		The valve sound or tube sound refers to the sound often associated with music amplified by a valve amplifier, although this association is not rigourous.
		The valve sound is often descrived as being "warm", "rich", "relaxed" etc, in contrast to a so-called transistor-sound that is sometimes said to be faster or even "harsh" and "brittle".
		The subject is further complicated by the way triodes and MOSFETS have certain similarities in their transfer characteristics, whereas later forms of the valve, the tetrode and pentode have quite different characteristics, in some ways reminicient of the transistor.
	www.supercrawler.com /Facts/valve_sound.html (644 words)

	Audio Technica AT4060
		Valve mics are very much in fashion at the moment, with many of the more established companies trying to recreate their former glories at affordable prices, often by re-engineering some parts of the design to reduce the build cost.
		The valve, which is a miniature type, is hand-selected and internal anti-vibration mountings are employed for both the valve and the capsule to minimise tube microphony and handling noise.
		Indeed, the output transformer required to interface the high-impedance world of the valve to the much lower impedance of a typical mixer mic input often adds as much to the sound as the valve does, so it's hard to pin down exactly where in the circuit the magic comes from.
	www.soundonsound.com /sos/nov98/articles/atm4060.htm (1402 words)

	REACH FOR THE STARS
		Although replacing matched pairs of valves is relatively expensive, the balanced push-pull circuit topology of the unit is claimed to provide a useful valve life of at least three years between replacements, so the running costs are not too daunting.
		As the performance of these valves alters with age, it becomes necessary to trim the meter circuit, for which purpose a pair of electronic zeroing trimmers has been provided in the centre of the front panel, although they are not marked to indicate which control relates to which meter.
		With gentle compression settings the valve processing is extraordinarily transparent and neutral — none of that heavy, rich, stereotypical valve sound which so many retro units try to produce — yet it still manages to add a delicate warmth to the sound which somehow seems to improve the cohesiveness of any track passed through it.
	www.soundonsound.com /sos/feb00/articles/chiswick.htm (2114 words)

	Supra Blow Off Valves
		Both the 87-92 Supra and 93+ TT Supra come stock with a bypass valve that will allow the turbo air to be routed back into the intake stream when the throttle plate is closed.
		These valves have a tendency to wear out over time, but are very good for those on a budget.
		Sound output can be changed by turning the red circle base to desired sound level.
	www.socalsupras.com /tuning/blowoffvalve.html (736 words)

	New To Guitars - TheGuitarSite.com, TGS Gear Mall, guitars
		Valves typically need to be replaced up to once a year to maintain peak performance.
		There was much debate at the time that valve amplifiers produced overdrive with primarily even harmonics (musically related to the fundamental and therefore desirable), while transistor amplifiers produced odd harmonics which do not have a musical relationship to the note(s) played.
		The "Marshall sound" valve - 2 or 4 are typically used for 50 or 100 watts.
	www.theguitarsite.com /new/primer_ampvalve.asp (1707 words)

	Valve Amplifiers (Site not responding. Last check: 2007-11-01)
		This is used in valved amplifiers to match the valves (which demand a high impedance load) to the loudspeaker, which is a low impedance device.
		Valves are inherently high impedance devices, and the effects of back-EMF from the speaker are therefore far less likely to achieve significant penetration at sufficient level to degrade performance.
		In our experience, a top valved amp gives a sweeter, smoother result than a top transistorised amp, but this is a generalisation and we have heard at least one transistorised amplifier, currently being developed by A~~, a local manufacturer, which seems to have none of the audible deficiencies of either type.
	sound.westhost.com /hfr_be.htm (2498 words)

	Amplifier Sound - What Are The Influences?
		The sound might be "smeared" due to the loss of detail during the recovery time of the IC amp.
		Valve amplifiers usually have a relatively high output impedance (typically 1 to 6 Ohms), while solid state amps will normally have an output impedance of a fraction of an Ohm.
		Valve amps are the most respectable of all, having a "soft" clipping characteristic which is comparatively unobtrusive.
	sound.westhost.com /amp-sound.htm (8214 words)

	Hammer Sound Browser - Valve Developer Community
		Raw sounds are the files on disk that the scripts refer to, in either.wav or.mp3 format.
		When Autoplay Sounds is not checked, press this button can be used to play a sound selected in the sound list.
		If the Sound Browser was launched from a Object Properties dialog, the selected sound in the list will be entered into the Object Properties field.
	developer.valvesoftware.com /wiki/Hammer_Sound_Browser (203 words)

	Bluetone Amplifers: Virtual Valve Technology
		Much of the character of early valve amplifiers is attributable to the relatively low, and non linear, gain of the valves themselves and the inherent requirement to AC couple the separate stages.
		This process is at the heart of the overdrive sound because in early valve amplifier designs the overload distortion is produced at the output stage not the pre-amps (unlike many modern high gain valve amplifier designs).
		The output stage overdrive sound is maintained at a similar distortion level, regardless of the drive level over and above clipping, because it is protected by the overload clipping characteristic of the previous phase splitter stage; in turn this is protected by the EQ driver and so on back to the initial amplifier stage.
	members.aol.com /bluetoneamps/vvt.html (1748 words)

	Bluetone Amplifiers: Review of Present Guitar Amps
		Modern valve amplifiers are essentially "master volume" products which tend to have two channels, one clean and the other over driven to produce distortion in the valve pre-amp.
		Valve hybrid (valve pre amp and transistor power amp) and all transistor amplifiers are again essentially "master volume" products with two channels, one clean and the other over driven to produce distortion using diodes or valves (in hybrid amps) for supposed "soft clipping" in the pre-amp.
		The sounds are a little dry and lack bite compared to older valve amplifier designs and they are also less responsive to guitar volume and tone control changes.
	members.aol.com /bluetoneamps/reviews.html (498 words)

	Comparison: 1388 Technology Bit88 Universal Sound Enhancer versus Evergreen Technologies RumbleFX 3D Sound Amplifier
		Cunning little circuits that are meant to make little speakers close together sound bigger and further apart, or to make bass where little bass is to be found, or to "clarify" or "excite" or "sweeten" the sound from any number of sources.
		Valves run hot and wear out and are sensitive to vibration and cost a lot more than transistors with similar amplification capabilities, which is why you don't see a whole lot of valves in modern electronics.
		Even if the valve lasts for the three to five years they claim - or the at least five years they claim elsewhere - that's still up around the plausible life span of the electrolytic capacitors that stud the Bit88 board.
	www.dansdata.com /srsthings.htm (5337 words)

	Grand Valve tasting experiment with X-Can V2
		The JJ E88CC's are not the pair I originally reviewed (I thought they sounded awful) these are from an older batch and have a slightly different construction to the "newer" batch so I will include these in the test as my supplier reckons the older batch may sound a lot better.
		The music through these valves was uninvolving, distant and had a very "rubbery" quality which gave the impression you were listening to neoprene coated musicians.
		These valves imparted a delicate quality which allowed me to hear through and into the mix of layered recordings revealing the varied texture of the instruments.
	www.rock-grotto.co.uk /valvetest.htm (1061 words)

	EIP Tuning Forced Induction Blow Off Valves: EIP carries HKS, Greddy, Turbonetics, Bosch, and Blitz. (Site not responding. Last check: 2007-11-01)
		The CNC machined aluminum valve is coated with a hard anodizing, to withstand extreme friction, maintain an airtight seal and increase durability.
		To ensure a proper valve movement, a durable, air tight, pressure resistant Bellofram diaphragm is used.
		Valve adjustment is as simple as turning the silver knob left or right to preload the internal spring.
	www.eiptuning.com /eip/blowoffvalve.html (814 words)

	YouTube - Valve Sound System Documentary
		Mate, heard the Valve sound system in full effect last weekend in Bristol and ive never felt my body shake like that in a DnB gig.
		I heard the Valve Soundsystem once in Belgium but maaan freakin awesome, but 2 days after my ears were still peeping
		Valve sound sound-system dillinja drum bass dnb jungle drumnbass drumandbass (more) (less)
	www.youtube.com /watch?v=62jjsbhNdGs (330 words)

	Ultraprobe Ultrasonic Detection Applications
		As fluid moves from the high pressure side of a valve through the seat to the low pressure side, it produces turbulence.
		In order to determine valve condition such as leakage or blockage: touch upstream of the valve and reduce the sensitivity of the instrument until the meter/display panel reads about 50% of scale.
		Ultrasonic valve inspection is considered a "positive" test in that an operator can instantly identify sound quality and intensity differentials and thereby determine operating condition accurately.
	www.uesystems.com /why_up_apps_valve_steam_trap.asp (346 words)

	20W Guitar valve amp
		The gold ears fraternity however will emphatically claim that the thermoic electronic valve is the ultimate pinnacle in electronic design and that nothing else can compare to the sound of a valve amp amplifying the sound of their treasured vinyl records.
		The desired overdriven sound stems from the early days of rock and roll in the 50s and 60s when the average power of the amplifiers was only 30 watts.
		One very noticeable feature of a valve amp is that it appears to be much more responsive and louder than a transistor amp of the same power rating in that the initial attack of the cord punches through before the amp starts to power limit.
	myweb.absa.co.za /g.landry/elvee-20.htm (3942 words)

	NA BLOW OFF SOUND GENERATOR
		The sound from the NA Blow Off Valve can be adjusted to be the same as a turbo blow off valve.
		For example, if the timbre sound is not satisfactorily after purchase, the unit can be send back to be reprogrammed to the timbre data that you have or you prefer.
		As for the NA Blow Off Valve, the sound is generated from a loudspeaker by playing with the frequency of the sound.
	www.takakaira.com /accessories/nightpager/nightpager.html (821 words)

	Inthepipeline Valve Sound page
		Most everyone prefers the sound of valves to transistors whether they are aware of it or not!
		It might sound strange to introduce the subject of distortion when, from a "HiFi" point of view this is something we strive to eliminate, but it will always be there in your system in some guise or another.
		Valves sound better because of the sort of distortion they produce.
	www.inthepipeline.net /valve_sound.htm (393 words)

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