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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Nuvistor Internals Inside view of a 6CW4, after a narrow ring of the case had been ground away so that it could be lifted clear. Both valves have been plugged into their sockets, which don’t add too much to the overall size. If you’re interested in investing in one or two, then eBay.

Sources of Valve Data There are many sources of data for valves, for example: A special case design was developed for these new valves, resulting in small size and very good high frequency performance, which are clearly good news for the RF stages of TV sets, but also have other useful attributes for more onerous applications.

RCA’s data for the 6CW4 showing the physical construction and dimensions. Heater power of less than 1W was 5786 for most Nuvistors, and with typical anode voltages in the range V and even lower in some specialised applicationsHT nuvostor consumption could also be kept low.

Potentiometer digital Variable capacitor Varicap. For example the A’s heater consumed 2. The electromagnetic pulse EMP produced by a nuclear explosion is likely to disable any transistor stages of a radio and so just protecting the front end is probably not enough. Use in Sonobuoys The RCAand triodes, and power tetrode, were nuvkstor to operate nuivstor sonobuoys.

Nuvistor Valves

The tetrode grid number 1 connection is made via the metal shell, giving a solid low inductance connection to the chassis in grounded-grid amplifiers. In a RCA advert the company claimed:.

The tetrode case also used for some triodes has an anode cap, insulated from the metal case by a ceramic ring. When I first started researching this article, my nuvistog was that TV tuners were the intended and most significant use for Nuvistors, as many Internet-based descriptions seem to nuvistod. RCA engineers scrapped old ideas – took a fresh look at tube design. These ‘short’ pins support the internal structure, along with the ‘long’ ones.

A useful website on valves, with a section dedicated to Nucistor can be found here. This picture shows very well the coaxial nature of the heater, cathode, grid and anode electrodes.

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7586 NOS Vacuum Tube Jan RCA Nuvistor

This low heater power implies a simpler and cheaper method of heater supply generation and less heat needed to be removed from the equipment’s enclosure. Innovation at the End of the Valve Era The development of the Nuvistor in the lates was probably the last major innovation in receiving valve technology, coming as it did towards the end of the era of thermionic device domination. Stable operation is possible with Nuvistors over wide temperature ranges [degrees] C to [degrees] C. See below for how these pins look on a 6CW4.

As a result of a proof-test-model PTM nuvistor failure prior to the Ranger mission, it had been determined that the nuvistor leads which had only a single wrap before soldering were susceptible to cold joints and subsequent fracture’. If you search for ‘nuvistor project’ on Google you’ll get lots of hits for audio and radio projects that you might want to build. It is interesting to note that the Collins RA valve-based radio, first used ‘in anger’ during the Korean War, was rushed back into US military service in the first Gulf War because many of the state-of-the-art solid state receivers with their transistor RF front-ends were failing due to the high static charges attributed to the desert heat, low humidity and sand storms!

Other applications included high-quality studio microphones, tape recorders, FM radio front ends, amateur radio equipment, and most significantly, military and space equipment. The VF was used in the war in portable field radios, and was not manufactured after the war, and suitable valves were selected from what limited stocks still existed.

Nuvistors in Military Service The small size and rugged construction of the Nuvistor would seem to make it ideal for use in military applications. From the date of this advert, the picture is probably an artist’s impression of a Mercury mission.

NOS Vacuum Tube Jan RCA Nuvistor | eBay

The schematic of the 6CW4 grounded-cathode pre-amplifier in the July issue of Practical Television. It’s more likely that valves were used to give the front end a wider dynamic range and tolerance to strong signals. The Nuvistor is often regarded as a last desperate effort by valve manufacturers to stem the flow of ‘transistorisation’ which was becoming a torrent by this time.

Geloso, the famous Milan-based amateur radio equipment manufacturer, used the 6CW4 in many of their mids 6m, 2m and 70cm converters and transmitters. Use in the Audio Studio One famous audio application of the Nuvistor was in the mids Ampex MR, a costly studio-grade 1-inch 4-track tape recorder whose entire electronics section was based on triodes and push-pull pairs of tetrodes. Complete power supplies, replacement capacitors, and the valves for these microphones still come up for sale on eBay occasionally.


Nuvistors were also found in some high quality broadcast radios. What surprised them was the crudeness of the plane’s structure and its avionics, and it was found that a lot of the ostensibly modern avionics in the aircraft used Russian copies of Nuvistors, for what was believed to be nuclear survivability. Although the human crew might receive a lethal dose of radiation it would take some time for them to finally succumb and the expectation was that they would try to complete their mission in that time.

Mullard describe the valve as a high-slope RF pentode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment.

Along with low noise and low power this is a key reason why they have been used in microphones, and also in high-quality audio pre-amplifiers. This adaptor plugged into the Octal socket on the tester. They competed with the solid state revolution, and along with GE’s Compactronprobably held it at bay for a few years.

Readers’ comments as to whether this is true would be welcome. 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. The device perched on the box is a triode. nubistor

In a RCA advert the company claimed: The tube is made entirely of metal and ceramic. Unlike in a glass-based valve there is no getter structure, whose function is to eliminate the last traces of any remaining gasses after the valve has been evacuated and sealed.

Mullard’s diagram of nuvisstor internal structure of a Nuvistor helps work out which parts of the ‘de-capped’ 6CW4 do what. The answer is probably ‘yes’.

These microphones are still very well regarded and there are restoration services available to bring them back to pristine condition. This could explain why the prototype Nuviator radio used Nuvistors, but these were designed out for the production version of the radio.

Basing of the Nuvistor, photopin-outbase drawing.