KT66 Tube – Yetrode Vacuum Tube, Pentode ( Datasheet PDF )

Part Number: KT66

Function: Beam Power Tube, Pentode

Manufacturer: , Analog MetricETC

Images:KT66 pdf tube


The power dissipation of beam power tube KT66 can reach 25W. For audio frequency amplifier, it can
be used to class A and AB amplification.

A vacuum tube, also known as a valve, thermionic valve, or electron tube, is an electronic component that was widely used in electronic devices and circuits before the advent of semiconductor devices like transistors. Vacuum tubes were instrumental in the development of early electronic technology and played a crucial role in the evolution of electronics.

The basic construction of a vacuum tube consists of a glass or metal envelope containing electrodes (cathode, anode, and sometimes additional elements) and a vacuum or low-pressure gas inside the envelope.

1. Cathode: The cathode is a heated element inside the vacuum tube that emits electrons when heated. It is usually made of a metal or oxide-coated filament.

2. Anode (Plate): The anode is a positively charged electrode that attracts the electrons emitted by the cathode. It is typically a metal plate or mesh.

3. Control Grid (Grid): In some vacuum tubes, a control grid is placed between the cathode and the anode. The control grid can influence the flow of electrons between the cathode and anode, allowing the tube to function as an amplifier or other circuit element.


1. Filament Heating

UH : 6.3 V
IH : 1.27 A

2. Maximum Ratings:

Tetrode config. triodes config.
Plate voltage : 500 —400 V
Plate dissipation power : 25 —25–W
Second grid voltage : 400V
Second grid power dissipation : 35W
Cathode current : 200mA
Heater voltage between cathodes : ±100V
Girst grid resistance
for fix-biasing voltage : 0.1 MΩ
for self-biasing voltage : 0.5 M Ω […]

KT66 datasheet

KT66 PDF Datasheet

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