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Information - Help 
ID = 7735
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to DU4 = 505

Base Europe 3-Pin B3 (Eu H) (Codex=Eo)
Filament Vf 4 Volts / If 1 Ampere / Direct / Parallel, (AC/DC)
Description Va<500 rms at Ia <60mA mean. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
DU4: rtt
Michael Schlör


from Just Qvigstad

Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 2410     Replies: 1
DU4 (DU4)
Stuart Irwin

Hello All,

I notice that the photos for this tube are misplaced.  The DU4 is a rectifier made by Mullard and I believe is the equivalent of the Philips 506.  The photos show a De Forest tube, probably a triode.




Ernst Erb

Dear Stuart
How right you are! Thank you. DeForest made a couple of DV tubes and I can imagine that the V was read as an U. I moved the pictures to the DV4. I hope the DV4 is really a triode. I could not find any evidence about the DV4.

Now we miss a photo for the DU4 ... which is supposed to be a 505 (not 506).

End of forum contributions about this tube

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