The KT61 proper, also introduced during 1939, is an audio output beam tetrode valve, part of a family of similar valves from the Marconi-Osram Group and finds use in many classic hifi amplifiers, the Leak TL10 being one such example, the benefits of beam tetrodes also transfers well to guitar amplifiers where KT61 are seen as a useful modification in replacing 6V6 as the valve of choice to give a distinctive but desirable sound. But, who knows, why not tube roll with a couple of each and decide for yourself. OK, let's get this straight right from the start, I do know that the Mullard E元3 is actually a pentode but it’s both pin and electrically equivalent as well as being easier to drive whilst showing lower intermodulation distortion and was introduced at the same time as the KT61 in 1939.Īn interesting alternative and the youngest of this type being introduced during 1948 is Mazda's 6P25, a beam tetrode just like the KT61, it having slightly higher mutual conductance gm and with it's outer envelope screening whilst it may not be as pretty as a KT61 some say it is a better performer.

TUNING CAPACITORS, VARIABLE CAPACITORS & TRIMMERS.

The KT61 forms part of a series of very successful valves from M-OV and in this exhibit it is badged as a consumer Marconiphone device. The KT61 is an audio output valve and features the standard 6.3 Volt heater that was introduced from America.

TRANSISTORS, SEMICONDUCTORS & INTEGRATED CIRCUITS 6AG6 6P25 CV1438 CV2938 E元3 N147 OM9 Extras Marconi Brian Middleton Valve Gift Other KT61 exhibits.RESISTORS, VOLUME CONTROLS & POTENTIOMETERS.DISPLAY TUBES, NIXIE TUBES, MAGIC EYES,.VINTAGE RADIO & VALVE BROCHURES, CATALOGUES & DATA BOOKS.VCM, VALVE TESTERS, AVO & OTHER TEST EQUIPMENT.SILK COATED RADIO WIRE, BRAIDED TELCOTHENE SLEEVING & OTHER WIRES.RESTORATION PROJECT, AMATEUR RADIO, MILITARY RADIO, DOMESTIC RADIO.AMATEUR RADIO: 6146 6146A 6146B PA OUTPUT VALVES.

Valve el33 and kt61