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Radio Battery Eliminator (High tension supply unit) Introduced in 1928. The 3003 can provide six different anode voltages and also three ranges of grid bias voltages that can be adjusted in steps between 0 and -40 Volts. The 3003 had incorrect tubes, one open resistor and a short circuited capacitor. It is now in working condition. Three special plugs, needed to choose the right grid bias voltages are still missing, but can be replaced by standard banana plugs. Data Valves       Serial number: Personeel 20679 Dimensions: 16 x 18 x 23 cm Made in: ± 1928 Purchased in: 2005     Click on a valve for more information Circuit   Valves Back Advertisement in Radio Expres, May 16th, 1928 Article in newspaper NRC, March 15th, 1928

This page was last edited on 21.01.2012