DY802

Description  The DY802 is an EHT rectifier for monochrome TV service as colour television tubes usually required 25 kV EHT.The 1.4 Volt heater was designed to be run from a winding on the transformer supplying the EHT. This would be an HF transformer similar to the line output transformer of a television receiver.
The DY802 is designed for a maximum PIV of 30,000 Volts and will produce an output voltage of 20,000 Volts. The maximum reservoir capacitor is 0.003 μF.The anode bell contains the indirectly heated cathode.
Manufacturer BEL
Country of Origin India
Introduction Year 1965

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DK92 / 1AC6

Description The DK92 is a miniature heptode frequency changer for use in dry battery powered radio receivers. Domestic long and medium wave receivers would have this as the mixer to produce a 455 kHz IF from the incoming signal. It can be used with a separate oscillator, but was probably designed as a self oscillating mixer, in the manner of other pentagrid converters.
Manufacturer Mullard
Country of Origin Great Britain
Introduction Year 1951

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DH77

OLYMPUS DIGITAL CAMERA

Description The DH77 / 6AT6 is an amplifier triode with twin signal diodes on a common cathode. It was designed for use in superhet receivers located at the end of the IF chain and as the first audio amplifier feeding the output stage.
Manufacturer *
Country of Origin  *
Introduction Year 1950

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DF96

Description The DF96 is a miniature amplifier pentode with very low filament consumption. This Mullard valve from 1953 has half of the filament current of its predecessor the DF92. It was specified for use as an IF amplifier in portable radio equipment.
Manufacturer Mullard
Country of Origin  Britain
Introduction Year 1953

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9D6

Description The 9D6 miniature variable μ pentode was designed to operate at HF. This suggests radio frequency amplifiers as well as intermediate frequency amplifiers.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 43 mm long.
Manufacturer *
Country of Origin *
Introduction Year 1947

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6×5 GT

Description The 6X5GT is a standard HT rectifier for low power AC mains driven equipment. The output of a centre tapped transformer would be applied to the anodes, the rating given is 325-0-325, the common cathode would be the output for the rectified voltage. A effective series resistance of 350 Ohms was required to limit surges and the reservoir capacitor had to be restricted to 16 µF. Nothing special and soon replaced by miniature valves of higher specification.
Manufacturer Brimar
Country of Origin  England
Introduction Year 1936

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6v6 GT

Description This 6V6GT is from Mullard and does not feature a Mullard type number. This shows the degree to which the 6V6 was regarded as a standard. Unlike most 6V6’s this valve has a glass disc base, like the all glass valves, and not a pinch. It is interesting to note that the original metal 6V6 also had a glass disc base, and only the glass valves that followed the original metal valve used the older pinch construction. The EL34 introduced in 1954 also has the same style of glass disc base with lead-out wires going into the IO plastic base rather than directly to pins. It is probable that this valve was designed in the late 1940s or early 1950s.
The 6V6 family of beam tetrodes came in many constructions and were very popular as the final audio stage of broadcast receivers. The original 6V6 was an American metal can valve from the mid 1930s, and one of the first valves on an IO base.
The valves were capable of push pull use but the normal environment was as a single end output stage.
Manufacturer Hitachi
Country of Origin  Japan
Introduction Year 1938

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6SF5

Description The 6SF5 is a high gain triode designed for RC coupled voltage amplifier use in audio equipment, especially vehicle battery powered sets. The 12SF5 differs only in heater rating.
The 12SF5 is the same valve but equipped with a 12.6 Volt heater.The reverse of the metal tube envelope carries the Raytheon logo.As with most valves the usage is to a limited set of licence conditions. Basically you can use it but do not use it as a template for making copies.
Manufacturer RCA
Country of Origin  USA
Introduction Year 1938

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6LX8, LCF802

Description 6LX8 is a triode-pentode intendedprimarily for horizontal oscillator and AFC service in the horizontal deflection systems of television receivers.
Manufacturer Matsushita
Country of Origin  Japan
Introduction Year 1973

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4EH7, LF183

Description Its a frame grid remote cut-off pentode designed for use as an IF amplifier in television receivers.
Manufacturer Matsushita
Country of Origin Japan
Introduction Year 1960

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