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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Languages Polski Edit links. This design also minimized interference of secondary emission electrons dislodged from the anode.

In the s the production used black base caps dattasheet pre-WWII had the classic envelope shape. The KT66 was very popular in European radios and audio amplifiers. 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.

The two tubes were nearly interchangeable, except that the KT66 was somewhat more rugged than the early metal 6L6.

KT66 GEC Datasheet

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.

From the s KT66 s lacked the internal carbon dust coating of the glass bulb. From Wikipedia, the free encyclopedia. The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe.


Vacuum tubes Guitar amplification tubes Telecommunications-related introductions in 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. While these tubes have the same pinout and minimum tolerances tk66 of a KT66 tube, they do not have the performance characteristics of a true kinkless tetrode KT66 tube.

All articles with unsourced statements Articles with unsourced statements from March Articles containing potentially dated statements from All vatasheet containing potentially dated statements. 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. Type KT66 was first introduced in Views Read Edit View history.

The KT66 is a very well known audio output beam tetrode valve. The shape of the envelope is a mixture of the classic shape and the wide tube. M-OV ceased glass vacuum tube manufacturing in ; their old audio tube types became valuable collectibles.

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.

In other projects Wikimedia Commons. The El37 has a high value of gm of The KT66 was essentially a 6L6 redesigned with a larger cathode and a shorter, fatter anode.

The KT66 had less rapid acceleration, longer electron paths, and almost no kink. Datashet the KT66 was advertised as the finest audio tube in the world.

Because this overall design eliminated the “tetrode kink” in the lower parts ,t66 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”.


Retrieved from ” https: This page was last edited on 6 Mayat The EL37 is not a direct equivalent and neither is the 6L6. Owen Harries and marketed by the Hivac Co. By using this site, you agree to kf66 Terms of Use and Privacy Policy.

JJ Electronic – KT66

By contrast the very latest Russian manufactured tubes not only carry the same internal electrode structure as the original KT66 they now look vatasheet 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.

It is not uncommon to find these valves used in parallel push pull. Our exhibit is a post-WWII device, probably dating from the s. M-OV of Britain in Due to the metalisation on the inner of the envelope the electrode structure is obscured.

Harries is believed to be the first engineer to discover datasjeet “critical distance” effect, which maximized the efficiency of a power kf66 by positioning its anode at a distance which is a specific multiple of the screen grid – cathode distance.