CL4 (CL4)

Looking at the data on this tube I read a filament voltage of 26 volts, while the Muiderkring schematic indicates 33 volts. I checked  Brands radio-tubes vademecum, that also indicates 33 volts filament. So I suggest a correction.

Best regards.  Jan Terranea.

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 Hello Jan,

the heater voltage of older CL4 version is 33 volts, which was later reduced to 26 volts.
See also in «Endpentode CL4» at “Bild 300” right top and right down.

Best Regards, Jacob

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