Svetlana EL34/6CA7 Vacuum Tube

Svetlana EL34/6CA7 High Performance Audio Power Pentode


The Svetlana™ EL34 is a glass envelope power pentode having a plate dissipation rating of 25 Watts with convection cooling. It is intended for audio frequency power amplification service in either pentode, ultralinear or triode connection and single or push-pull/parallel applications. The Svetlana EL34 has an indirectly-heated oxide cathode, which may be DC operated for the absolute best hum/noise performance.

The Svetlana EL34 is manufactured with the original Mullard design in the Svetlana factory in St. Petersburg, Russia, and is designed to be a direct replacement for any EL34/6CA7 or equivalent. The Svetlana EL34 gives electrical and audio performance very similar to that of the original Mullard EL34.

Picture 1: Svetlana EL34/6CA7 Vacuum Tube & Bottom view (octal base connections)


Electrical Characteristics:


> Heater Voltage (AC or DC): Min. 5.7 V, Nom. 6.3 V, Max. 6.9 V
> Heater Current: 1.6 A
> Cathode: Oxide-coated, unipotential
> Cathode-to-heater potential, max. 100 V
> Direct interelectrode capacitances, max.:
- Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heater < 16 pF - Plate to cathode and grid no.3, grid no.2, base sleeve and heater < 0.6 pF - Grid no.1 to plate < 1.1 pF


Typical Operation - AF Power Amplifier, Class A1 (single tube):

> Plate Voltage 250 V
> Grid 2 Screen Voltage 250 V
> Grid 1 Control Voltage -14 V
> Peak AF Grid 1 Control Voltage 14 V
> Zero Signal Plate Current 100 mA
> Maximum Signal Plate Current 105 mA
> Zero Signal Grid 2 Screen Current (avg) 15 mA
> Transconductance (nominal) 11,000 µS
> Load Resistance 2000 Ohms
> Output Power at 5% distortion 10 W



*This tube can be find as SED EL34.


Source: Svetlana Tubes (SED Thermionic Valves).