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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Type KT66 was first introduced in 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 @ The Valve Museum

The shape of the envelope is a mixture of the classic shape and the wide tube. 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.

Retrieved from ” https: The EL37 is not a direct equivalent and neither is the 6L6. M-OV of Britain in Class-A amplifiersingle-ended Class-AB amplifierpush—pull.

KT66 GEC Datasheet

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. Because of their excellent electrical characteristics and overload tolerance, KT66s are preferred by some guitar players for datawheet in guitar amps in place of 6L6GC.


In other projects Wikimedia Commons. The KT66 daatasheet essentially a 6L6 redesigned with a larger cathode and a shorter, fatter anode. This design also minimized interference of secondary emission electrons dislodged from the anode.

By using this site, you agree to the Terms of Use and Privacy Policy. From Wikipedia, the free encyclopedia. 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.

Languages Polski Edit links. 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”.

M-OV ceased glass vacuum tube manufacturing in ; their old dataxheet tube types became valuable collectibles. It is not uncommon to find these valves used in parallel push pull.

Here each single valve of the push pull pair is replaced with two valves connected in parallel. Due to the metalisation on the inner of the envelope the electrode structure is obscured.

In the KT66 was advertised as the finest audio tube in the world. The KT66 is a datashset well known audio output beam tetrode valve. All articles with unsourced statements Articles with unsourced statements from March Articles containing potentially dated statements from All articles containing potentially dated statements.


The two tubes were nearly interchangeable, except that the KT66 was somewhat more rugged than the early metal 6L6. Views Read Edit View history. Owen Harries and marketed by the Hivac Co.

The beam tetrode design was also kf66 to avoid the patents which the giant Philips firm held on power pentodes in Europe. This page was last edited on 6 Mayat The KT66 had less rapid acceleration, longer electron paths, and almost no kink. 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.

The El37 has a high value of gm of Vacuum tubes Guitar amplification tubes Telecommunications-related introductions in In the s the production used black base caps and pre-WWII had the classic envelope shape.