KT66 is the designator for a beam power tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937 and marketed for application as a power amplifier for audio frequencies …

The KT66 is a very well known audio output beam tetrode valve. Our exhibit is a post-WWII device, probably dating from the 1960s. From the 1970s KT66 s lacked the internal carbon …

The KT66 is a high slope, indirectly heated beam triode designed principally for use in the output stage of audio amplifiers. It may also be used as an oscillator or R.F. power amplifier for …

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Vintage Marconi Osram KT66 tubes. Marconi's were labeled as Genelex and GEC. These are the holy grail KT66 for a JTM45. This is a matched pair and when I bought them they tested at …

This is a vintage pair of KT66 Mullard tubes. Made in England. Tested with a calibrated Hickok 605 with no shorts and no gas....see photos Tested in an amp with 470 Vdc B+ and they work …

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Genalex Gold Lion KT66 Power Tube, Matched Pair. Brand New w/ 24-hour Burn In! View similar gear from other sellers on Reverb. Watch this gear and we'll notify you if it becomes available …

The KT66, originally given the Type code N66, is a very well known audio output beam tetrode valve. Our exhibit is a post-WWII device, probably dating from the 1970s, as from the 1970s …

I have a single vintage new testing Osram KT66. I tested it on a B&K707 no shorts tests 115 out of 120 on the green scale (very good). $125 obo Trade...