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EM3

Information - Help 
ID = 6439
       
Country:
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 base P (P8A) (Codex=S)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  em3.gif
  EM3: ficha de valvulas
Getulio Jimenez-Gomez
 
em3_a.jpg
EM3: Ulrich Fieseler
Ulrich Fieseler

 
90_2.png
EM3: Telefunken Werkstattbuch
Wolfgang Bauer

 
em3_spec.png
EM3: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


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

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):17


Forum contributions about this tube
EM3
Threads: 1 | Posts: 3
Hits: 1726     Replies: 2
EM3 (EM3) tube replacement.
Bruno Gandolfo-Canepa
21.Jan.08
  1

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
21.Jan.08
  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
25.Jan.08
  3

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.

 
EM3
End of forum contributions about this tube

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