KT66 Marconi early red logo rare valves black base smoked glass original Marconi boxes EL37 6L6G equivalent

Description

The Marconi KT66 is a tetrode having an anode dissipation of 25 W.

It may be used as an audio amplifiers or an oscillator and radio frequency amplifier

As an audio amplifier up to 50W may be obtained from two valves, tetrode connected. As a push-pull triode it has no equal for use in high quality equipment when an output of 14/15 watts is required.

The KT66 is very robust, both electrically and mechanically, once it is suitable for many industrial applications.

This section attempts to cover all KT66 made from the post WWII till the 1960s

Here we have a lovely quartet of Marconi KT66 red label, smoked glass with b;ack base and full cup getter, holy grail! Late 1940s valves with stunning sound like all KT66s.

When the KT66 was launched it was named the Finest Audio Tube ever made!

KT66 GEC smoked glass black base tested at 6.3 Volts filament

Anode and Screen 250 Volts

Negative grid – 15

Current 65mA

mA/V 6.3

Tested with AVO VCM 163 at: 80mA, 79mA, 80mA, 78.9mA 100% emission and working order

Supplied with original Marconi boxes