Fundamental number: filament current 0 colder cathode (for example voltage regulator tube). 1 0.1 – 2.0 2 2.1 – 2.9 3 3.0 – 3.9 letter n.0 – n.9
Document or letters: series laws a small number of emails to suggest the sequence code. As soon as the unmarried figure programs were utilised all the way up, double characteristics codes were launched. Remember that U – Z generally speaking (but not always) given that the sole character, or previous fictional character, are used for rectifiers
Final amounts: feature count The number of areas in the hose, the filament counting since 1. One example is, the 6SN7 provides two cathodes, two grids, two plates, and a filament.
Further mail: a regulated heaters warmup occasion, although can also be used to signify increasing scores or abilities over and above the non-A model. B better ratings/performance. C Ditto. G windshield light. GT windshield tubular. W Ruggedised type. X reduced loss ceramic bottom. Y reduced reduction phenolic bottom.
Examples: 6SN7GT: Filament scoring was between 6.0 – 6.9V, SN=sequence laws, 7 features, windows tubular envelope. 6V6GTY: Filament rating was between 6.0 – 6.9V, V=sequence code, 6 features, windows tubular package, reduced control phenolic starting point. 12AY7: Filament rank was between 12.0 – 12.9V, AY=sequence rule, 7 details.
Specifically what does J.H.S. and J.A.N. indicate?
Sylvania was the manufacturer of army tubes and chosen a 3 digit lettering process to employ Sylvania merchandise. One process prefixes a three-digit quantity aided by the characters «VT», apparently which means «machine Tube». Additional methods prefix the number by using the letters JHS or JAN. J.A.N. is believed to face for spot Army Navy, where as, J.H.S. at times stays a mystery, and is generally believed to merely represent Sylvania goods.
The number as a result of these prefixes is often special four-digit figures, or home-based two- or three- digit number or just the domestic North American RETMA numbering technique. Simillar to the Uk military services technique, these have a lot of direct equivalents in civil varieties. Confusingly, the British furthermore have two completely various VT nomenclatures, one utilized by the noble Air power in addition to the other made use of by the Post Office, in charge of post and telecom back then, wherein it may possibly bring stood for Valve, phone; none of these techniques corresponded by any means with each other. It had been released during next community conflict to rationalise the previous nomenclatures preserved separately from the warfare Office/Ministry of source, Admiralty and surroundings Ministry/Ministry of jets Production on the behalf of three of the armed services for CRTs, obtaining and shifting regulators in military gadgets.
Personally has explored this before, while having compose the theory that JHS would be selected by Sylvania implying Joint Havells Sylvania or J.H.S.
Havells Sylvania is actually a worldwide developer and company of lights products. It’s flowers throughout European countries, Parts of asia, North Africa and core and South America, and is one of the few burning firms that provides both lamps and lighting. It is actually owned by Havells.Founded in the early 1900s as an organization that revived burned-out lights, Sylvania and its forerunner businesses inevitably set about providing brand-new bulbs right after which vacuum tubes for wireless discipline.
MEANINGLESS LIMITATIONS by HOSE REMARKETERS:
Both Tung-Sol and RCA used the «Stop-Sign» logo  in supports. The «hole» within the greatest mica identifies these United States Of America generated pipes within the TUNG-SOL manufacturer in Newark, nj, American inside the fifties.
THE UNITED-ELECTRIC RELABEL RULE 88-37 happens to be MEANINGLESS BECAUSE THEY BASICALLY RELABELED brand new OLD STOCK TUBES FROM TUNG-SOL. RCA, SYLVANIA, AS WELL AS OTHERS. NO BODY MADE D-GETTER otherwise SQUARE-GETTER TUBES IN 1988! AND UNITED-ELECTRONICS was actually BANKRUPT IN 1988! SO 88-37 WAS UNITED-ELECTRONICS INTERIOR NUMBERING METHOD AND WOULDN’T SIGNIFY all PROCESSING DAY.
Specifically, through the 50’s war efforts, it absolutely was a typical exercise for UNITED STATE manufacturing plants to starting point pipes from oneself and re-label all of them. Whenever a federal government requirement of CV4017 hose requirements came in a Request For suggestion (RFP) within the 4 significant USA tube production facilities all of them functioned jointly to website from one another to load the sales. That’s why we come across several pipes made by Tung-Sol defined as RCA, RCA manufactured pipes identified Sylvania, Sylvania earned tubes branded GE . and the like, Sylvania, RCA, Tung-Sol and everyone else at some point relabeled pipes! Its for these reasons we should CHECK OUT THE AUTHENTIC MANUFACTURING FACILITY CODES IF CURRENT (NOT THE UNITED ELECTRONICS RELABEL CODE),, and identify the authentic hose vendor by programs, internal quality, model of the end, and shape of the getter band to ascertain the true origins for the tubes.