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(Philips Lorenz Telefunken Siemens)

Introduction Characteristics


EC92

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F2a - F2a11

Tube Overview

 

 

The F2a11 or KL-73551 Gallery

 
   

  The F2a11 is electrically the same as the famous "post tube" F2a, which was used in many 1950s and 1960s telegrafic amplifiers by the German Post. The only difference is the socket.

  Concerning the Siemens audio amplifiers the F2a11 substituted the EL12 (as in the Klangfilm 401 amp and changing to the 402/403 amp) and finally was substituted by the more common EL84 in lower power applications and by the EL34 where more power was necessary.

  F2a11s are reliable and great sounding audio tubes in push-pull amps with up to 30 watts or in single ended stages up to 7 watts. Other famous amps using F2a11 tubes are the Telefunken V69 and the V69a.

  All F2a11s shown were made by Siemens in their home plant.

 

 

 

Type #1

Characteristics:

- double getter

- filament visible

Comment:

Seems to be an early type

 

Type #2

Characteristics:

- double getter

- filament visible

- black plates

Comment:

Seems to be an early type

 

 

 

Type #3

Characteristics:

- double getter

- closed stapled plate

Comment:

Getter as above tube - plate construction as right

 

Type #4

Characteristics:

- small ring getter

- one getter support

- closed stapled plate

Comment:

Ventilation holes in base

 

 

 

Type #5

Characteristics:

- small ring getter

- one getter support

- closed stapled plate

Comment:

No mica spacers at bottom

 

Type #6

Characteristics:

- bigger ring getter

- two getter supports

- closed stapled plate

Comment:

Similar to above tube

  -

 

 

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