By G. W. A. Dummer, J. Mackenzie Robertson

British distinctive caliber Valves and Electron Tube units facts Annual: 1964-65 offers info on quite a few precise caliber valves. the choice additionally provides info in several kinds of specific electron tubes and units.
The textual content discloses details similar to heater, capacitance, features, working stipulations, and diversity values. As for electron tubes and units, the choice provides the features, cathodes, average operation, and greatest rankings.
The ebook may be of serious use to electronics designers, engineers, and technicians. Electronics hobbyists and end-users also will enjoy the textual content.

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Extra info for British Special Quality Valves and Electron Tube Devices Data Annual 1964–65

Sample text

Samples are taken from these batches and are subjected to a wide range of tests. Complete batches are accepted or rejected according to rigid rules applied to the results of the sample tests. For example, no valves can be delivered unless the specified life tests have been satisfactorily completed. In order to appreciate the actual quality level achieved by the use of these specifications, it is necessary to remember that the assessment tests are applied regularly to consecutive batches of continuous production.

Cathode current increased temperature of elements and/or potential gradient o o o Max. heater-cathode voltage Voltage breakdown of insulation Increased rate of heater-cathode shorts O O Max. anode or screen dissipation Increased potential gradient Min. heater voltage Accelerated evolution of gas (positive shifts in bias and progressive loss of emission) Thermal expansion of valve parts (shorts and temporary change of characteristics) Accelerated formation of leakage paths Cracks in the glass envelope Increased contact "potential" Shortened heater life Max.

Pentode Double triode for use in computers High slope wideband amplifying pentode .. F. F. F. F. F. F. F. F. F. F. F. F. F. pentode with separate g3 Double triode for use in computers Double triode for use in computers Mullard Type Number — Services Type Number — ECF80 CV5215 — — — — — — — — ECC88 CV5358 — — — — — — — — — — — — — — — — EB91 EC90 ECC91 EL91 EF91 CV140 CV133 CV858 CV136 CV138 EY84 EAC91 EC91 EF95 ECC82 ECC83 EF92 ECC81 CV2235 CV137 CV417 CV850 CV491 CV492 CV131 CV455 EF86 6AS6 6AL5 EC98 EF730 EC71 EF732 EF731 EL71 ECC70 CV2901 CV2522 CV283 EF734 — — — — — — — — — — American Type Number 1 — 6BL8 — — — — 6DJ8 — 1 — — I I I I — I — 6C4 6J6 — 1 — I — — ~~ 6AK5 12AU7 12AX7 — 12AT7 — 6AS6 6AL5 t6J4 φ The A m e r i c a n types shown have the s a m e e l e c t r i c a l c h a r a c t e r i s t i c s a s the a p p r o p r i a t e Mullard Special Quality type and they may, in g e n e r a l , be r e garded as i n t e r c h a n g e a b l e .

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