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23 May 2017 


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6AS7G Svetlana tube data

6AS7 Dual Power Triode Manufactured by Svetlana

The 6AS7 Dual Power Triode is for High Performance Audio Applications

The Svetlana™ 6AS7 is a glass envelope, dual power triode with high transconductance and high plate current capacity. Each triode has a plate dissipation rating of 13 Watts with convection cooling. It is intended for low distortion audio frequency power amplification service in either single or push-pull/parallel tube applications. The Svetlana 6AS7 has an indirectly-heated unipotential cathode. The heater may be DC operated for the absolute best hum/noise performance.

The Svetlana 6AS7A was originally designed as a series pass tube in regulated power supplies. Low plate resistance makes it an excellent choice in OTL and other high performance audio circuits. Close manufacturing specification tolerances and improved processing provides enhanced reliability and superior sonic performance.

The Svetlana 6AS7 is manufactured in the Svetlana factory in Russia, and is designed to be a direct replacement for any 6AS7.

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Photo of 6AS7 Dual Power Triode Manufactured by Svetlana

Svetlana 6AS7

Diagram showing physical dimensions of 6AS7 manufactured by Svetlana

Diagram showing physical
dimesions of Svetlana 6AS7

Diagram showing bottom view of octal base connections

Bottom view of octal base connections

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

General Characteristics

Electrical

Heater: Min. Nom. Max.  

Voltage (AC or DC)

5.7 6.3 6.9 V

Current

  2.5   A
Cathode: Oxide-coated, unipotential
Cathode-to-heater potential, max.     ± 300 V
Direct interelectrode capacitances, max. ***        

Grid to cathode

    8  

Plate to cathode

    3  

Grid no.1 tp plate

    11  

Mechanical

Operating Position**       Any
Base JEDEC 8BD, octal 8-pin
Maximum dimensions:

Height

140 mm (5.51 in.)

Diameter

52 mm (2.05 in.)
Cooling Convection
Approximate net weight 90g (3.2 oz.)
 
**When mounting horizontally, pins 1 & 8 must be in the same horizontal plane
***Without external shielding, nominal values

AF Power Amplifier

Maximum ratings (per triode)

DC plate voltage   250 V
Transconductant   5500 µS
Grid no.1 (control) voltage   -150 V
DC cathode current   130 mA
Plate resistance   280 Ω
Plate dissipation   13 W
Bulb temperature (surface hottest point)   250° C

Typical Operation, Audio Power Amplifier, Class A,

Two Triodes, Push Pull

Plate voltage   250 V
Zero signal plate current   80 mA
Max signal plate current   110 mA
Cathode resistor (each triode)   1250 Ohms
Peak grid to grid AF signal   250 Vp-p
Effective load resistance   6000 Ohms
Power output   10 W

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Graph showing typical characteristics for each triode

Graph showing typical characteristics for each triode

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