KT66 Osram same code on glass!! Blue logo brown base smoked glass CV1075 EL37 6L6G with original boxes

Description

The GEC 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

The holy grail of KT66 is here to stay! Matched quartet KT66 Osram brown base, smoked glass with full cup getter! codes are ALL the same for all four valves that is KL 10, please refer to pictures.

Osram KT66 late 1940s valves with stunning sound like all KT66s.

MINT NOS like all KT66 here listed

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

KT66 Osram, smoked glass 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: 77mA, 76mA, 76mA, 77mA 100% emission and working order

Supplied with original Osram GEC boxes