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	iB::Topic::Nuvistors, Pencil tubes...
		The CN series used all nuvistors except for the crystal oscillator tube and were made for the 6 meter, 2 meter, and 1.25 meter bands as well as for other bands including the commercial and satellite bands.
		The Nuvistor was originally developed by RCA to be used as the r.f.
		The Nuvistor tubes excelled at VHF and UHF because of their small size, and low power consumption (for hollow state devices.) as well as being designed for low noise figure.
	www.qrz.com /ib-bin/ikonboard.cgi?s=8d6cecb1fa52a163ab8f827e71b68654;act=ST;f=5;t=121053;st=0 (2927 words)

	Nuvistor
		The nuvistor is a type of vacuum tube developed by RCA in the 1960s.
		Triodes and tetrodes were made, although tetrode nuvistors are rare.
		Nuvistors are among the highest performing small signal receiving tubes.
	www.ebroadcast.com.au /lookup/encyclopedia/nu/Nuvistor.html (118 words)

	Nuvistor
		The nuvistor is a type of vacuum tube announced by RCA in 1959.
		Making nuvistors requires special equipment, since there is no intubation to pump gases out of the envelope.
		Instead, the entire structure is assembled, inserted into its metal envelope, sealed and processed in a large vacuum chamber with simple robotic devices.
	pedia.newsfilter.co.uk /wikipedia/n/nu/nuvistor.html (195 words)

	Nuvistor
		nuvistor je druh elektronky vyvinut RCA v šedesátých létech.
		Triodes a tetrodes byly dělány, ačkoli nuvistors tetrode jsou vzácné.
		Nuvistors je mezi nejvyšší předvádění malý signalizují jímací zkumavky.
	wikipedia.infostar.cz /n/nu/nuvistor.html (119 words)

	YourArt.com >> Encyclopedia >> Nuvistor (Site not responding. Last check: 2007-10-22)
		The nuvistor is a type of vacuum tube announced by RCA in 1959.
		Making nuvistors requires special equipment, since there is no intubation to pump gases out of the envelope.
		One notorious application was in the Ampex MR-70, a costly studio tape recorder whose entire electronics section was based on nuvistors.
	www.yourart.com /research/encyclopedia.cgi?subject=/Nuvistor (236 words)

	Reference.com/Encyclopedia/Nuvistor
		The nuvistor is a type of vacuum tube announced by RCA in 1959.
		Making nuvistors requires special equipment, since there is no intubation to pump gases out of the envelope.
		One famous application was in the Ampex MR-70, a costly studio tape recorder whose entire electronics section was based on nuvistors.
	www.reference.com /browse/wiki/Nuvistor (271 words)

	AnaLog on Nuvistors
		The Nuvistor was heralded as a threat to the transistor; they were initially attractive because they handled momentary overloads better and they were higher impedance devices than the transistors of 1959 (those advantages disappeared with improvements in semiconductors).
		Thousands of Nuvistors were used in TV tuners in the 1960's, and many were in fact used in military and industrial equipment (prior to the commercial availability of FETs, some were used as high impedance input stages in otherwise solid state equipment) (see our Vintage Oscilloscopes page).
		Nuvistors were characterized for satisfactory operation to 350° C, explaining why some logging tool manufacturers continued to use them up into the 1980's.
	www.logwell.com /tech/components/nuvistors.html (613 words)

	Nuvistor
		They feature excellent VHF and UHF performance plus low noise figures, and were widely used in 1960s televisions, radio equipment and high-fidelity equipment, primarily in RF sections.
		One notorious application was in the Ampex MR-70, a costly studio tape recorder whose entire electronics section was based on nuvistors.
		RCA 6DS4 "Nuvistor" triode vacuum tube--approx size 20 mm high by 11 mm diameter
	www.askfactmaster.com /Nuvistor (231 words)

	About the Nuvistor Triode
		Nuvistors, being in the tube family, are high-impedance devices--circuit components are generally less expensive.
		The Nuvistor, a miniature metal-envelope tube, was another major advance in vacuum-tube technology, following on the heels of the cold-cathode tube.
		Not only was the nuvistor found in high performance VHF receivers it was also used in the popular Tektronix oscilloscopes of the 60s in their wideband Y amplifiers were it happily co-existed with transistors.
	digilander.libero.it /paeng/what_the_nuvistor.htm (385 words)

	TNT PreAmble N - DIY nuvistor stereo preamplifier [English]
		Nuvistors were the last born in the classic tube world: designed when the transistors were already taking the lead, they are miniaturized thermionic tubes in a metal case.
		Unfortunately, the nuvistor data sheets show characteristics that are not so ideal in terms of linearity, and in facts the circuit did not prove so exceptional with regards to measures.
		Even for nuvistors, special care is suggested for the power supply on the audio board: two paralleled capacitors, a 3300uF electrolytic (more of a reservoir than a real filter component...) and a 0.47uF paper in oil, are placed near the nuvistors.
	www.tnt-audio.com /clinica/preamble_n.html (2147 words)

	R: Who has nuvistor experience ?
		The 6CW4 is a triode with 6.3 volts for filament and 70 volts for the plate voltage and is very small only 2 cm high including the pins and 2 cm in diameter but since the envelope is metallic it became very hot during operation and you cannot touch it with your finger !
		I have succesfully used the above downconverters for 144 and 432 MHz and I have the technical manuals of it with complete schematic diagrams and if you are interested I can send it to you as a scanned copy.
		Also I have few 6CW4 for spare but I believe that actually the most difficult part to find as new is the socket for a Nuvistor.
	www.amsat.org /amsat/archive/amsat-bb/200409/msg00451.html (273 words)

	Stereophile: Musical Fidelity Nu-Vista 300 power amplifier
		Enclosing its vacuum in metal rather than glass, the Nuvistor was designed as a long-lived, highly linear device with low heat, low microphony, and low noise---all of which it needed to have any hope of competing in the brave new solid-state world emerging when RCA introduced it in the 1960s.
		With four Nuvistors (two per channel) also in each amplifier's front-end circuitry, and a spare set on hand for each amp as well, that's a total of at least 8000 Nuvistors procured by Mr.
		With the Nuvistor's life expectancy of approximately 100,000 hours, Musical Fidelity figures that, with the second set of Nuvistors in waiting, the life expectancy of the limited-edition preamp and amp should be 25 to 30 years.
	www.stereophile.com /amplificationreviews/205/index.html (478 words)

	AKG Acoustics - C-12A (Site not responding. Last check: 2007-10-22)
		You make an assumption in your question that the Nuvistor is the key to the sound and value differences between C12 and C12A.
		The Nuvistor is only one third (my guess) of the story, the other two thirds of the significant sound difference between C12 and C12A is in the amplifier circuitry:
		In the case of the C12, the gain is picked up at the plate of the tube, in the case of the C12A a “cathode-follower” circuit is used.
	akg.com /akg_structuretree/forum/topics/powerslave,_detail,1,id,486,... (328 words)

	Nuvistors
		The Nuvistor was the final evolution of the thermionic valve as a general purpose active circuit element.
		Above, left, is an example of the first released Nuvistor type, the 7586, manufactured by Philips at Eindhoven and branded 'Mullard' for the U.K. market.
		Nuvistors have very low inter electrode capacitances and transit times which means they are usable at VHF and low UHF frequencies, where they considerably out performed the transistors then available.
	www.andycowley.com /valves/var/7586/Nuvistor.html (381 words)

	Tube DataSheets
		Nuvistors were the latest tube development at just about the same time as the introduction of the first integrated semiconductor circuits.
		A nuvistor is a miniature vacuum tube in a thimble sized metal case.
		AKG used a nuvistor in the C12A mics and a RCA 7586 nuvistor in the C61 mics.
	www.drtube.com /tubedata.htm (499 words)

	Torbens hi-fi side: Nuvistor
		6CW4 Triode (Nuvistor) The Nuvistor from RCA was a form of triode for use at VHF and build into a metal case just larger than a transistor.
		The Nuvistor is built as a series of co-axial electrodes but they are all very small, and small inter electrode capacitances result.
		Mange audiofile har udtrykt at disse nuvistorer lyder kanon godt, bedre end traditionelle rør, er det fordi de forvrænger mere?, det er sandsynligt at der vil være mere gang i lydbilledet med flere detaljer i måske forkerte proportioner med disse rør (men måske er det, der skal til for at give en illusion af virkeligheden??).P.s.
	www.tkhifi.com /div/nuvista.html (417 words)

	The Nuvistor
		Although Nuvistors are really designed for professional andindustrial applications, they may, nevertheless, prove of interest to the experimenter.
		The first is arranged in the earthed-cathode mode with leaky-grid biasing, as in Figure 2, while the second is wired in an earthed-grid circuit with the amplified signal tapped off L2 at a suitable point to match the cathode circuit of the second valve.
		Cascaded circuits are rarely required, however, for a single-stage Nuvistor circuit operating in front of a television tuner will almost certainly make a 2-3dB improvement in the noise figure while also providing a gain up to 40 or 50 times, depending upon the bandwidth and how well the amplifier is constructed and neutralised.
	www.thevalvepage.com /valvetek/Nuvistor/nuvistor.htm (1783 words)

	Comminication Electronics incorporated 901-1 surveillance receiver
		Clean, uncluttered layout, gold colored sub chasses, nuvistors, ceramic planar tubes, cutting edge solid-state devices (in the power supply only - early germanium transistors and diodes), compact packaging and the highest quality assembly standards were hallmarks of their designs.
		The rest of the active devices in the tuners were all nuvistors.
		The nuvistor is a small metal and ceramic vacuum tube with wire leads.
	watkins-johnson.terryo.org /CEI-Receivers/901-1.htm (855 words)

	The Nuvistor
		Although Nuvistors are really designed for professional andindustrial applications, they may, nevertheless, prove of interest to the experimenter.
		Ordinary cathode bias is used on the second stage by R1, and the neutralisation is applied capacitively from the end of L4 to the grid circuit of the first stage, via C2.
		Cascaded circuits are rarely required, however, for a single-stage Nuvistor circuit operating in front of a television tuner will almost certainly make a 2-3dB improvement in the noise figure while also providing a gain up to 40 or 50 times, depending upon the bandwidth and how well the amplifier is constructed and neutralised.
	www.jogis-roehrenbude.de /Roehren-Geschichtliches/EL503/J%fcrgen/EL503-Daten%20an%20Jogi/R%f6hrendatenbank+Infos/Sonderr%f6hren/Nuvistor/?S=D (1764 words)

	Audion Circuit Review
		A compact tube that compared in size to a transistor, the nuvistor saw use in a variety of industrial circuits where its compact size, ruggedness and low threshold noise made it a preferred choice in demanding applications.
		McIntosh used a pair in the front end of its MX series of tuners, and Scott used the tube for two years (1963-65) in its premier line of tuners, including the 4312, 312, 344, and the 348.
		It shared the IF and multiplex adaptor stages that were used in the 312 and featured a front end that when implemented in the 344B with FETs instead of nuvistors, would serve as the basis for all Scott tuners post 312D.
	www.lacieg2s.ca /w3terra/ols/scott312.htm (1583 words)

	HHScott Vacuum Tubes -- 6CW4 - 6DS4 - Nuvistor Applications
		RCA's (1959) introduction of the Nuvistor vacuum tube, heralded one of the attempts of tube manufacturers to hold onto a major portion of the small–signal amplification market.
		Unfortunately (for tube aficionados), the release of the Nuvistor appeared at the same time as the announcement of the first integrated circuit, and its fate was all but sealed right from the start.
		* Nuvistors, being in the tube family, are high-impedance devices -- circuit components are generally less expensive.
	hhscott.com /cc/nuvistors.htm (296 words)

	Tubes To Transistors - The Transition
		The Nuvistor is a thimble-sized unit (enclosed in a metal envelope rather than glass) that promised high-reliability, low-noise, and low-power operation.
		Designed mainly for military and test-equipment applications, the Nuvistor bridged the gap between valves and transistors to ease the transition from hollow-state to solid-state.
		Not only was the Nuvistor found in high performance VHF receivers it was also used in the popular Tektronix oscilloscopes of the 1960's in their wideband Y amplifiers where it happily co-existed with transistors.
	www.portabletubes.co.uk /sitefiles/newtubes.htm (961 words)

	Welcome to Musical Fidelity (Site not responding. Last check: 2007-10-22)
		It is well known that certain Field Effect Transistors exhibit similar characteristics to triode valves and in particular allow the very high input impedance circuitry otherwise only achievable with valves.
		Our aim here was to replicate as closely as possible the natural and open clarity we are able to achieve with the Nu-Vista but utilising a contemporary FET.
		The JFET we eventually selected was chosen after extensive measuremnet and listening tests of a very large number of possible alternatives for its very close relation to the 6CW4 Nuvistor in terms of both its sonic fingerprint and measured performance.
	www.musicalfidelity.com /products/archived/xp100.html (231 words)

	HeadWize: DIY Workshop > A 3-volt tube amp
		A nuvistor gain stage is not too bad, i think.
		The 7586 nuvistor in the TNT preamp is pretty expensive.
		Nuvistors are not especially good tubes for anything except wall-power (maybe aircraft) VHF/UHF applications.
	headwize.com /ubb/showpage.php?fnum=3&tid=5764&fpage=ptid (2507 words)

	PSW Recording Forums: Klaus Heyne's Mic Lab => nuvistor u47 popping
		i have on order a new nuvistor, and i am wondering if the.01mfd 400v cap could be bad- which is actually in this mic a.01/200vdc cap.
		There comes a time into a repair project when I need to admit that a specialist who has taken apart a few of these convoluted, idiotic electric window mechanisms in a Vanagon will deal with its repair faster, cheaper, and with less aggravation than I can muster.
		With the Nuvistor model you will need exactly 110 VDC at the red wire coming off pin #5 of the Tuchel connector in the mic to have correct supply voltage.
	recforums.prosoundweb.com /index.php/t/5832/0 (2330 words)

	HV-1 & HV-1a Nuvistor Pre-Preamplifier
		It was a simple linear gain stage designed to provide the added gain required by low output moving coil cartridge.
		Nuvistors are small metal-enclosed triode vacuum tubes noted for their extraordinary linearity and low noise.
		RF Filters and traps were judiciously executed to minimize noise and external interference, two things that made many other pre-preamps unacceptable in audiophile systems.
	www.conradjohnson.com /It_just_sounds_right/a-hv1.html (157 words)

	Nuvistor zero NFB, passive RIAA Preamp Project (Site not responding. Last check: 2007-10-22)
		Its a good starting place as there are no extra gain stages than whats needed,and NO feedback necessary due to the super linearity of the nuvistors.
		Drawbacks are the microphonics of the nuvistor, its being no longer in production, and that there are no cool looking glowing tubes sticking up out of the chassis.
		nuvistors as they are far too microphonic per Barbour.
	web.mit.edu /cheever/www/nuvpre.htm (307 words)

	Audion Circuit Review
		A compact tube that compared in size to a transistor, it saw use in a variety of industrial circuits where its compact size, ruggedness and low threshold noise made it a preferred choice in demanding applications.
		Both revisions to the 348 took place in step with the changes that were being made to Scott's primary broadcast monitor, the 312.
		The nuvistor equipped 348 is also a rarity; its tenure in the model's two year lifespan amounted to several months, as the receiver kept pace with developments in the 312 series.
	www.lacieg2s.ca /w3terra/ols/scott348.htm (2034 words)

	HeadWize: DIY Workshop > Amplifier Stages
		Anyway I read in Musical Fidelity's new homepage that the X-CanV2 was originally to be installed with Nuvistors as its tubes.
		It was meant to be a Nuvistor Headphone amp.
		Re: X-Cans w/nuvistors - if that story is true, I would guess that MF found more profitable ways of using their limited supply of nuvistors.
	www.headwize.com /ubb/showpage.php?fnum=3&tid=686&fpage=ptid (657 words)

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