Siemens - Klangfilm
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Output Transformers
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The F2a11 or KL-73551 Gallery |
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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. |
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Type #1 Characteristics: - double getter - filament visible Comment: Seems to be an early type |
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Type #2 Characteristics: - double getter - filament visible - black plates Comment: Seems to be an early type |
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Type #3 Characteristics: - double getter - closed stapled plate Comment: Getter as above tube - plate construction as right |
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Type #4 Characteristics: - small ring getter - one getter support - closed stapled plate Comment: Ventilation holes in base |
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Type #5 Characteristics: - small ring getter - one getter support - closed stapled plate Comment: No mica spacers at bottom |
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Type #6 Characteristics: - bigger ring getter - two getter supports - closed stapled plate Comment: Similar to above tube |
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