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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In the s the production used black base caps and pre-WWII had the classic envelope shape. M-OV ceased glass vacuum tube manufacturing in ; their old audio tube types became valuable collectibles. Vacuum tubes Guitar amplification tubes Telecommunications-related introductions in The two tubes were nearly interchangeable, except that the KT66 was somewhat more rugged than the early metal datasheett.

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. The lt66 of the envelope is a mixture of the classic shape and the wide tube. Class-A amplifier datashdet, single-ended Class-AB amplifierpush—pull. Due to the metalisation on the inner of the envelope the electrode structure is obscured. This design also minimized interference of secondary emission electrons dislodged from the anode.

The KT66 is a very well known audio output beam tetrode valve. 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”. kkt66


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

M-OV of Britain in In other projects Wikimedia Commons. Our exhibit is a post-WWII device, probably dating from the s. The El37 has a high value of gm of All articles with unsourced statements Articles with unsourced statements from March Articles containing daasheet dated statements from All articles containing potentially dated statements.

By using this site, you agree to the Terms of Use and Privacy Policy. This page was last edited on 6 Mayat Because of their excellent electrical characteristics and overload tolerance, KT66s are preferred datwsheet some guitar players for use in guitar amps in place of 6L6GC. Retrieved from ” https: 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.

From the s KT66 s lacked the internal carbon dust coating of the glass bulb. Here each single valve of the push pull pair is replaced with two valves connected in parallel.

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. In the KT66 was advertised as the finest audio tube in the world.


Type KT66 was first introduced in 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. Languages Polski Edit links.

The KT66 was essentially a 6L6 redesigned with a larger cathode and a shorter, fatter anode. 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.

TDSL Tube data [KT66]

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. It is not uncommon to find these valves used in parallel push pull.

Views Read Edit View history. The KT66 was very popular in European radios and audio amplifiers. The EL37 is not a direct equivalent and neither is the 6L6.

Owen Harries and marketed by the Hivac Co.