Unch Na 6p3s

Main article: Receiving tubes have heaters or filaments intended for direct battery operation, parallel operation off a dedicated winding on a supply transformer, or series string operation on transformer-less sets. High-power are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the 5.25 V range, drawing up to hundreds of amperes from a suitable heater transformer. In some valve part number series, the voltage class of the heater is given in the part number, and a similar valve might be available with several different heater voltage ratings. Tube bases and envelopes [ ]. Main article: Abbreviations used in this list [ ] • ST – Shouldered tube • GT – Glass tube • MT – Miniature tube, such as or • FL – Subminiature all-glass elliptical body and flat bases with long, inline 'flying leads' (pigtails) that are soldered into the circuit • SL – Subminiature all-glass elliptical body and flat bases with short inline leads that can be soldered or can be mated with a special socket.

Disodium phosphate (DSP), or sodium hydrogen phosphate, or sodium phosphate dibasic, is the inorganic compound with the formula Na 2 HPO 4. It is one of several sodium phosphates. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 hydrates.

(Flying leads can be cut short to fit into inline sockets.) • R8 – Subminiature all-glass round body and base with 8 flying leads or stiff pins arranged in a circle Numbering systems [ ] North American systems [ ] RMA system (1942) [ ]. Main article: The system assigned numbers with the base form '1A21', and is therefore also referred to as the '1A21 system'. Main article: RETMA is the acronym for the Radio Electronic Television Manufacturers Association formed in 1953. • The first character group is a number representing the heater voltage rounded to the nearest whole number; 0 indicates a. • One or two letters assigned to the devices in order of development. • A single numeral that represents the number of active elements in the tube.

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