Dimension and connections: KT A. F. BEAM PENTODE. Base: OCTAL. Uf. = 6, 3 V. If. = cca 1,3 A. Typical characteristic: Ua. = V. Ug2 = V. -Ug1 = The classic envelope is 50 mm in diameter and, excluding the IO base pins, is mm tall. References: Datasheet,, &. Type KT66 was first introduced in KT Osram. VALVES. KT66 POWER TETRODE. DESCRIPTION. Type KT66 is a high slope, indirectly beated beam tetrode designed principally for use in.

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The two tubes were nearly interchangeable, except that the KT66 was somewhat more rugged than the early metal 6L6. The KT66 was very popular in European radios and audio amplifiers. Because this overall design eliminated the “tetrode kink” in the lower parts of ktt66 tetrode’s voltage-current characteristic curves which sometimes caused tetrode amplifiers to become unstableM-OV marketed this tube family as the “KT” series, standing for “kinkless tetrode”.

The KT66 is a very well known audio output beam tetrode valve. All articles with unsourced statements Datashest with unsourced statements from March Articles containing potentially dated statements from All articles containing potentially dated statements. This page was last edited on 6 Mayat The El37 has a high value of gm of The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe.

TDSL Tube data [KT66]

By using this site, you agree to the Terms of Use and Privacy Policy. By contrast the very latest Russian manufactured tubes not only carry the same internal electrode structure as the original KT66 they now look the same they also have the same rugged electrical characteristics and can withstand a high voltage on grid 2 comparable to the anode voltage rating, allowing greater power datashset afforded by higher voltage capability when run in ultralinear connection.


Retrieved from ” https: It is not uncommon to find these valves used in parallel push pull. While these tubes have the same pinout and minimum tolerances required of a KT66 tube, they do not have the performance characteristics of a true kinkless tetrode KT66 tube. The KT66 was essentially a 6L6 redesigned with a larger cathode and a shorter, fatter anode. Languages Polski Edit links. Harries is believed to be the first engineer datasheett discover the “critical distance” effect, which maximized the efficiency of a power tetrode by positioning its anode at a distance which is a specific multiple of the screen grid – cathode distance.

The shape of the envelope is a mixture of the classic shape and the wide tube. EMI engineers Cabot Bull and Sidney Rodda improved the Harries design with a pair of beam plates, connected to the cathode, which directed the electron streams into two narrow areas and also acted like a suppressor grid to deflect some secondary electrons back to the anode.

It was ace for audio hi-fi but the electrons took longer to reach the anode and were more open to influence from magnetic, etc, fields on the way. Class-A amplifiersingle-ended Class-AB amplifierpush—pull.

M-OV of Britain in In the s the production used black base caps and pre-WWII had the classic envelope shape. Type KT66 was first introduced in Vacuum tubes Guitar amplification tubes Telecommunications-related introductions in From the s KT66 s lacked the internal carbon dust coating of the glass ky66.


datashert Moreover, under HF conditions the electron stream was fatasheet perfectly in phase with the grid signal and this resulted in a loss of output power if used for RF applications. This design also minimized interference of secondary emission electrons dislodged from the anode. Our exhibit is a post-WWII device, probably dating from the s. In the KT66 was advertised as the finest audio tube in the world.

The KT66 had less rapid acceleration, longer electron paths, and almost no kink.

KT66 GEC Datasheet

From Wikipedia, the free encyclopedia. Views Read Edit View history. Due to the metalisation on the kt66 of the envelope the electrode structure is obscured. The EL37 is not a direct equivalent and neither is the 6L6.

Here each single valve of the push kt66 pair is replaced with two valves connected in parallel. M-OV ceased glass vacuum tube manufacturing in ; their old audio tube types became valuable collectibles.

Because of their excellent electrical characteristics and overload tolerance, KT66s are preferred by some guitar players for use in guitar amps in place of 6L6GC. In other projects Wikimedia Commons. Owen Harries and marketed by the Hivac Co.