as a guide only – please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. ECC85 Ratings. Page 1. Page 2. Page 3. ECC85 Datasheet PDF Download – Double Triode, ECC85 data sheet.

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This is a list of vacuum tubes or thermionic valvesand low-pressure gas-filled tubesor discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced.

Only dayasheet few types are still used today, mainly in high-power, high-frequency applications.

(PDF) ECC85 Datasheet download

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 RF power tubes are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the 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.

The system assigned numbers with the base form “1A21”, and is therefore also referred to as the “1A21 system”. Often designations that differed only in their initial numerals would be identical except for heater characteristics. For examples see below. A four-digit system was maintained by the EIA for special industrial, military and professional vacuum and gas-filled tubes, and all sorts of other devices requiring to be sealed off against the external atmosphere.

Some manufacterers preceded the EIA number with a manufacterer’s code:. Media related to Eimac vacuum tubes at Wikimedia Commons. This system is very descriptive of what type of device triode, diode, pentode etc. This part dates back to the joint valve code key German: Like the North American system the first symbol describes the heater voltage, in this case, a Roman letter rather than a number.

Further Roman letters, up to three, describe the device followed by one to four numerals assigned in a semi-chronological order of type development within number ranges assigned to different base types. If two devices share the same type designation other than the first letter e. ECL82, PCL82, UCL82 they will usually be identical except for heater specifications; however there are exceptions, particularly with output types for example, both the PL84 and UL84 differ significantly from the EL84 in certain major characteristics, although they have the same pinout and similar power rating.

However, device numbers do not reveal any similarity between different type families; e. Pro Electron maintained a subset of the M-P system after their establishment inwith only the first letters EP for the heater, only the second letters ABCDEFHKLMYZ for the type, and issuing only three-digit numbers starting with 123589 for the base. Vacuum tubes which had special qualities French: They were usually special-quality versions of standard types. While the E80F pentode was a high quality development of the EF80, they were not pin-compatible and could not be interchanged without rewiring the socket the E80F is commonly sought after as a high quality replacement for the similar EF86 type in guitar amplifiers.

The letters “CC” indicated the two triodes and the “F”, the single pentode inside these types. A few special-quality tubes did not have a standard equivalent, e. The E91H is a special heptode with a passivated third grid designed to reduce secondary emission; this device was used as a “gate”, allowing or blocking pulses applied to the first, control grid by changing the voltage on the third grid, in early computer circuits similar in function to the U.


Many of these types had gold-plated base pins and special heater configurations inside the nickel cathode tube designed to reduce hum pickup from the A.

Note that elevating the cathode voltage above the average heater voltage, which in well-designed equipment was supplied from a transformer with an earthed center-tapped secondary, was less detrimental to the oxide insulation between heater and cathode than lowering the cathode voltage below the heater voltage, helping to prevent pyrometallurgical electrolytic chemical reactions where the oxide touched the nickel cathode that could form conductive aluminium tungstate and which could ultimately develop into a heater-cathode short-circuit.

Better, often dual, getters were implemented to maintain a better vacuum, and more-rigid electrode supports introduced to reduce microphonics and improve vibration and shock resistance.

The mica spacers used in “SQ” and “PQ” types did not possess sharp protrusions which could flake off and become loose inside the bulb, possibly lodging between the grids and thus changing the characteristics of the device.

Dcc85 special-quality tubes had not base and function swapped but were assigned a 4-digit number, [8] such as ECC or ED, the first digit of which again denoting the base:. In use since at leastthis system was maintained by Pro Electron after their establishment in The first letter or letter pair, in the case of a dual-system device indicates the general type:.

The following letter indicates the filament or cathode type, or the fill gas or other construction detail. The coding for vacuum devices differs between Philips and other Continental European manufacturers on the one hand and its Mullard subsidiary on the other. The following letter indicates the photocathode type:.

The first incarnation of La Compagnie des Lampes produced the TM tube since and defined one of the first French systems; [1] [16] not to be confused with Compagnie des Lampes”French Mazda”, see dqtasheet.

Heater or filament rating [1]. This system consists of one or more letters followed by a sequentially assigned number [21]. The British GEC — Marconi—Osram designation from the s uses one or two letter s followed by two numerals and sometimes by a second letter identifying different versions of a particular type. K inkless T etrode beam power tubes are listed under other letter tubes – KT. Media related to Marconi vacuum tubes at Wikimedia Commons.

Older Mullard tubes were mostly designated PMfollowed by a number containing the filament voltage.

ECC85 Datasheet PDF –

Many later tubes were designated one to three semi-intuitive letters, followed by a number containing the heater voltage. This was phased out after when Mullard adopted the Mullard—Philips scheme. Media related to Mullard vacuum tubes at Wikimedia Commons. The system consisted of one letter followed by 3 or 4 digits.

It was phased out after when Philips adopted the Mullard—Philips scheme. Heater current [23] [1]. Media related to Philips vacuum tubes at Wikimedia Commons. Media related to Philips gas discharge tubes at Wikimedia Commons. Valvo deit was a major German electronic components manufacturer from to ; a Philips subsidiary sinceValvo was one of the predecessors of NXP Semiconductors. The system consisted of one or two letters followed by 3 or 4 digits. It was phased out after when Valvo adopted the Mullard—Philips scheme.

Media related to Valvo vacuum tubes at Wikimedia Commons. Media related to Valvo gas discharge tubes at Wikimedia Commons. Media related to Lamina vacuum tubes at Wikimedia Commons.

Daasheet related to Datashee gas discharge tubes at Wikimedia Commons. Rundfunk- und Fernmelde-Technik desv was the brand of a group of telecommunications manufacturers in the German Democratic Republic.

The designation consists of a group of three letters and a group of three or four digits. Type, subset of the Mullard—Philips system. Type, subset of the Mullard—Philips scheme. Media related to Tesla vacuum tubes at Wikimedia Commons.


Media related to Tesla gas discharge tubes at Wikimedia Commons. The Tungsram system was composed of a maximum of three letters and three dstasheet four digits. Media related to Tungsram vacuum tubes at Wikimedia Commons. Vacuum tubes produced in the former Soviet Union and in present-day Russia are designated in Cyrillic. Some confusion has been created in transliterating these designations to Latin. The first system was introduced in It consisted of one or two letters designating system type andoptionally, type of cathodea hyphen, then a sequentially assigned number with up to 3 digits.

In the s a 5-element system Russian: The first element is a number specifying filament voltage. The second element is a Cyrillic letter specifying the type of device. The third element is a sequentially assigned number that distinguishes between different devices of the same type. The fourth element denotes the type of envelope. An optional fifth element consists of a hyphen followed cec85 one or more characters to designate special characteristics of the tube.

This usually implies construction differences, not just selection from regular quality production. There is another designation system for professional tubes such as transmitter ones.

The first element designates function.

The next elements varies in interpretation. For ignitrons, rectifiers, and thyratrons, there is a digit, then hyphen, then the anode current in amperes, a slash, anode voltage in kV. A letter may be attached to designate water cooling no letter designates a radiation cooled device. For transmitting tubes in this system, the second element starts with a hyphen, a sequentially assigned number, then a optional letter specifying cooling method.

For phototubes and photomultipliers, the second element is a sequential number and then a letter code identifying vacuum or gas fill and the type of cathode. Datasheett and usage [31]. Then a daatasheet “-“followed by a sequentially assigned number or the designation of the American original.

ECC85 Datasheet PDF

JIS C was published in and modified in and [31]. This system prefixes a three- or four-digit number with the letters “CV”, meaning “civilian valve” i. The numbers identify special-quality valves though SQ valves CV numbered before that rule came in retain their original CV number.

This part-identification system ensures that every particular spare part not merely thermionic valves receives a unique stock number across the whole of NATO irrespective of the ecv85, and hence is not held inefficiently datasheeh separate stores. One system prefixes a three-digit number with the letters “VT”, presumably meaning “Vacuum Tube”. The numbers following these prefixes can be “special” four-digit numbers, or domestic two- or three-digit numbers or simply the domestic North American “RETMA” numbering system.

Like the British dahasheet system, these have many direct equivalents in the civilian types. Confusingly, the British also had two entirely different “VT” nomenclatures, one used by the Royal Air Force see the preceding section and the other used by the General Post Officeresponsible for post and telecommunications at the time, where it may have stood for “valve, telephone”; none of these schemes corresponded in any way with each other.

Various numeral-only systems exist. These tend to be used for devices used in commercial or industrial equipment. The oldest numbering systems date back to the early s, such as a two-digit numbering system, starting with the UVAwhich was considered as “type 01”, and extended almost continuously up into the s. Three- and four-digit numeral-only systems were maintained by R.