Data: LowLow quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
Same electricals but Octal base and 6.3V heater — FDD20 uses P8A base and 13V heater
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)330V
Anode Dissipation (max)Anode Dissipation (max, Class A per section)1.1W
Cathode Current (max)Peak Plate Current (max, Class B per section)140mA
Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)100V
Notes
Both triode sections share a common cathode — separate cathode biasing per section is not possible.
With exception of heater ratings and base, this tube is very similar to 6A6 and 6N7G (per Taschenbuch zum Röhren-Codex 1948/49).
Parameters are derived from the 6N7 GE datasheet, as no dedicated FDD20 manufacturer datasheet could be located. The 6N7 has identical electrical characteristics per the Röhren-Codex.
Class A Pa_max is only 1.0 W per section; Class B Pa_max is 5.5 W per section. The tube is primarily intended for Class B push-pull service or Class A driver use.
Also manufactured by Philips Italy (Milano) per radiomuseum.org.
13V heater is typical of European series-heater designs for AC/DC (transformerless) receivers.
Socket-Compatible Tubes ⚠ Not electrically compatible