Tube or Röhre ID, Triode, vacuum, Nuvistor and Universal shown. Radio tubes are valves. Find great deals for NOS Vacuum Tube Jan RCA Nuvistor. Shop with confidence on eBay!. The nuvistor is a type of vacuum tube announced by RCA in Most nuvistors are basically – First one released, medium mu triode; – Sharp cutoff tetrode; – triode for low plate voltages; – triode, with plate cap & grid.

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Having researched this subject I’m not sure this is true and hopefully after reading this article you’ll be able to form your own opinion. The Ranger series of unmanned spacecraft were launched between andand were the first US attempt to obtain close-up images of the Moon’s surface, in preparation for the manned landings at the end of the decade, as pledged by Nuvistkr Kennedy in The technical excellence of Nuvistors and powerful branding by RCA helped ensure a long design-in life for the technology.

Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. There is no glass envelope to be evacuated towards the end of the manufacturing process: A nuvistkr history of the RCA Company.

You may just be able to see the Nuvistor logo on the valve itself. Published by RCA in September In amateur service the EF was mainly used in the transmit, rather than the receive, path of VHF equipment. RCA’s special box with the Nuvistor logo on it. In adverts and application data the word ‘Nuvistor’ was printed in a unique font, giving the impression of a Nuvistor logo, and this can be seen in the Geloso advert later on in the article.


Nuvistors were not only used by NASA in space: RCA’s semiconductor division was doing well and intimately involved with transistor and integrated circuit development and manufacture. One famous application was in the Ampex MR, a costly studio tape recorder whose entire electronics section was based on nuvistors.

The case itself is often connected to the grid of the valve, making it relatively easy to get a good ground connection in grounded-grid circuits. In a RCA advert the company claimed:. 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.

They competed with the solid state revolution, and along with GE’s Compactronprobably held it at bay for a few years. Another competing valve was the E88CC which in theory should have been numbered as the ECC88, but the special quality of the valve was indicated in the Mullard coding system by the numbers being presented immediately after the ‘E’ twin triode service code CVagain in a B9A envelope, and with a 6.

Most nuvistors are basically thimble -shaped, but somewhat smaller than a thimble, and much smaller than conventional tubes of the day, almost approaching the compactness of early discrete transistor casings. Could RCA have developed a glass-based miniature valve with most of the attributes needed for use in TV tuners, and avoided the considerable tooling costs of putting the brand new mechanical design of the Nuvistor into production?

Conventional wisdom indicates that valves help to ‘nuclear-proof’ receiver front ends: One explanation is that RCA ‘transferred’ the design and manufacturing nuvisstor to Mullard under some mutually beneficial arrangement, as happened with many other valve designs. These microphones are still very well regarded and there are restoration services available to bring them back to pristine condition.

NOS Vacuum Tube Jan RCA Nuvistor | eBay

It’s more likely that valves were used to give the front end a wider dynamic range and tolerance to strong signals. RCA even shipped Nuvistors in a special box at least in the early days – See picture above with the Nuvistor logo on it, rather than the generic ‘RCA Electron Tube’ printed on most of their boxes. At first sight the fact that a new valve technology appeared in is surprising: In a RCA advert the company claimed: Brimar described its 6AM4 introduced in as being ‘for grounded-grid amplifier or mixer use in the frequency range to MHz’.

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Comments from readers who may have actually seen European Nuvistors being manufactured would be welcomed. Other applications included high-quality studio microphones, tape recorders, FM radio front ends, amateur radio equipment, and most significantly, military and space equipment. There may be ones I’ve missed, especially ‘special quality’ ones designed for rugged industrial applications.

Mullard’s exploded view of the Nuvistor triode and its component parts. I thought I’d open up a Nuvistor and see how closely the diagrams you can find on the Internet match reality.

7586 NOS Vacuum Tube Jan RCA Nuvistor

I’ve raised the possibility that Nufistor was the only company to actually manufacture Nuvistors in the Western world. Nuvistor Internals Inside view of a 6CW4, after a narrow ring of the case had nuviztor ground away so that it could be lifted clear. As well as showing the electrical components in the tuner I think this view shows the mechanical complexity of the unit.

I couldn’t find a description of exactly how the metal-ceramic seal was made.