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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M-OV of Britain in Owen Harries and marketed by the Hivac Co. 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.
This design also minimized interference of secondary emission electrons dislodged from the 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.
The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm datashert on power pentodes in Europe.
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 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 of their excellent electrical characteristics and overload tolerance, KT66s are preferred by some guitar players for use in guitar amps in place of 6L6GC. M-OV ceased glass vacuum tube manufacturing in ; their old audio tube types became valuable collectibles.
KT66 GEC Datasheet | EZ
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.
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.
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KT66 GEC Datasheet