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 KT66 had less rapid acceleration, longer electron paths, and almost no kink. The EL37 is not a direct equivalent and neither is the 6L6. Retrieved from ” https: It is not uncommon to find these valves used in parallel push pull.

M-OV of Britain in Views Read Edit View history. Due to the metalisation on the inner of the envelope the electrode structure is obscured. All articles with unsourced statements Articles with unsourced statements from March Articles containing potentially dated statements from All articles containing potentially dated statements.

While these tubes have the same pinout and minimum tolerances required of a KT66 tube, they do not have the performance datsheet of a true kinkless tetrode KT66 tube. 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 kt6 suppressor grid to deflect some secondary electrons back to the anode.


The El37 has a high value of gm of In other projects Wikimedia Commons. 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 output afforded by higher voltage capability when run in ultralinear connection.

Type KT66 was first introduced in Our exhibit is a post-WWII device, probably dating from the s.

KT66 GEC Datasheet

The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe. M-OV ceased glass vacuum tube manufacturing in ; their old audio tube types became valuable collectibles.

The KT66 is a very well known audio output beam tetrode valve. Vacuum tubes Guitar amplification tubes Telecommunications-related introductions in The two tubes were nearly interchangeable, datashfet that the KT66 was somewhat more rugged than the early metal 6L6. Languages Polski Edit links. This page was last edited on 6 Mayat In the KT66 was advertised as the finest audio tube in the world.

In the s the production used black base caps and pre-WWII had the classic envelope shape. From Wikipedia, the free encyclopedia. The KT66 was essentially a 6L6 redesigned with a larger cathode and a shorter, fatter 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. Here each single valve of the push pull pair is replaced with two valves connected in parallel. Because this overall design eliminated the “tetrode kink” in the lower parts of the 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 was very popular in European radios and audio amplifiers. By using this site, you agree to the Terms of Use and Privacy Policy.

Harries is believed to be the first engineer to 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.

KT66 – Wikipedia

Because of their excellent electrical characteristics and overload tolerance, KT66s are preferred by some guitar players for use in dafasheet amps in place of 6L6GC. From the s KT66 s lacked the internal carbon dust coating of the glass bulb.

Moreover, under HF conditions the electron stream was not perfectly in phase with the grid signal and this resulted in a loss of output power if used for RF applications.

This datasyeet also minimized interference of secondary emission electrons dislodged from the anode. Owen Harries and marketed by the Hivac Co.