Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 6439
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: Mullard Wireless, London (see also Mullard Radio Valve) 
Tube type:  Mag. Eye, 2 shadow angles   Indication 
Identical to EM3
First year 1938 Tube leaflet collection E.Erb Philips-Archive März 1938
First Source (s)
Mar.1938 : -- Original-techn. papers.

Base Europe side contact P8A (Au P, 8SC) (Codex=S)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
  EM3: ficha de valvulas
Getulio Jimenez-Gomez
EM3: Ulrich Fieseler
Ulrich Fieseler

EM3: Telefunken Werkstattbuch
Wolfgang Bauer

EM3: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1938?? ; 1= 1938? ; 6= 1938 ; 1= 1939? ; 4= 1939 ; 2= 1940?? ; 1= 1945? ; 2= 1947 ; 1= 1951 ; 1= 1953

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):20

Forum contributions about this tube
Threads: 1 | Posts: 3
Hits: 1942     Replies: 2
EM3 (EM3) tube replacement.
Bruno Gandolfo-Canepa

Dear collectors,

Which would be a reasonable tube replacement for the EM3, ideally with the same P8A base socket?

Thanks in advance, Bruno.

Jacob Roschy
  2 Hello Bruno,

the easiest substitution of the EM3 is the EM1. It has the same P8A base and even the same base diagram, so a direct replacement is possible.

But the EM1 has some disadvantages:

  • it's almost the same way unavailable as the EM3

  • it can handle only small AGC voltages up to -5 volts for full display. This means, for any stronger receiving signals, no change on the indication pattern will happen.

The next better substitution of the EM3 is the EM4, which also has a P8A base. The situation about the EM4 is:

  • it's also scarce to get

  • since it has 2 indication sections, it can handle week and strong signals as well, without any problems.

  • it requires some alteration in the base wiring: since the EM4 has 2 anodes, a second 1 meg ohm resistor has to be connected between a2 and L according to the EM4 base diagram.


Good luck with your EM3 replacement,

Best Regards, Jacob

Bruno Gandolfo-Canepa

Hello Jacob,

Thanks by your kind and supported answer. 

I am restoring a Philips 289A Export model for the Indies.  Fortunately I have the EM1 and EM4 NOS and I have determined to adapt the EM4 because the PH 289A has RF amp stage, four bands and two wide band , then it should be an interesting complex radio with good behavior in short wave reception. 

As usual you have been very kind again and I am very thanked. 

Best regards, Bruno.

End of forum contributions about this tube

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]