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ECH4A

Information - Help 
ID = 19469
       
Country:
Italy
Brand: Philips Italy; Milano (MI)
Tube type:  Triode-Heptode   Frequency converter 
  Late but very rare. ***
Identical to ECH4A
Similar Tubes
Other shape (e.g. bulb type):
  ECH34 ; ECH4G
Other base:
  ECH4
Multiple differences or of other kind:
  6TE8GT

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 6.3 Volts / If 0.35 Ampere / Indirect / Parallel, (AC/DC)
Literature Il Radio Libro, (Ravalico) 8.Ed.   
 
philips_ech4a_1.jpg
ECH4A: M.C.
Alessandro De Poi

 
6j9sgmbasdiag2~~1.png
ECH4A: schematic diagram
Jacob Roschy

 

Usage in Models 1= 1946? ; 1= 1946

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2


Forum contributions about this tube
ECH4A
Threads: 1 | Posts: 3
Hits: 1977     Replies: 2
ECH4A (ECH4A)
Jacob Roschy
30.Apr.09
  1

Fortunately we could find out information about data and origin of the before mysterious ECH4G.

Now the secret of this ECH4A is yet to be solved.

Because of the straight bulb shape the ECH4A may probably be an Octal version of the E1R ?

Can anybody confirm this, e.g. by comparing the data ? Even checking the heater current will give some evidence, since the heater current of the E1R is only 0.2 A, while the heater current of the normal ECH4 is about 0.35 A.

 

Best regards,

Jacob

 

Emilio Ciardiello
30.Apr.09
  2

Dear Jacob,

Ravalico gives the E1R as an ECH3 with modified base connections that are the same of ECH4. The ECH4A is given as electrically identical to ECH4, with octal base and cylindrical bulb. The two tubes, E1R and ECH4A, seem to have different origin according to the above source.
 

Best regards, Emilio

Jacob Roschy
06.May.09
  3

Dear Emilio,

thank you for this useful information.

About the same matter, I found additional information on this site: Le valvole convertitrici di frequenza .

After some research I could get more clarity about the ECH4 family, particularly about their octal versions. I hope, any open questions before, are now answered.

Since the Ex3x- series is the most common series of red-series octal tubes, I'll call the ECH34 as reference tube.

As usual in this series, the heater connections are on pins 2 & 7, according to the normal (American) octal standard.

The other ECH4 octal versions are in relation to the ECH34 as follows:

ECH4G = Australian version of the ECH34. Equivalent to the ECH34, but with golden painted bulb.

ECH4A = Italian version of the ECH34. Equivalent to the ECH34, but with straight GT-style bulb.

ECH4K = By now only found in some Swiss radios. Equivalent to the ECH34, with exception of the base diagram, which is the same as of the UCH4, with heater connections on pins 1 & 8.

E1R : With exception of the same base diagram as the ECH4, the triode-hexode E1R doesn't belong to the ECH4 triode-heptode family. It's merely an ECH3 with the base diagram of the ECH4 !

The relation of the E1R to the ECH3 is similar as the relation of the 6TE8 to the 6E8: E1R and 6TE8 are triode-hexodes with independent units.

Best regards,

Jacob

 
ECH4A
End of forum contributions about this tube

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