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EBF1

Information - Help 
ID = 10039
       
Country:
Australia
Brand: Philips Australia
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Double Diode-Pentode   RF/IF-Stage   Controlling (mu) 
Identical to EBF1 = TEBF1
Similar Tubes
Heater different:
  WE37F
Other base:
  6B7 ; 6B8G
First year 18.Dec.1936 Wireless Weekly (Australia) See also: The Courier-Mail Oct 9, 1936, page 17.
First Source (s)
1937 : Histoire de la lampe de radio
Feb.1937 : L'Histoire Singulière du Tube Radio; G. Duperray 2009
Predecessor Tubes E444  
Successor Tubes 1938   EBF2  

Base Europe side contact base P (P8A) (Codex=Saa)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel, (AC/DC)
Description

The EBF1 was first released by Philips Australia in 1936.

The radio sets Tasma Tiger & Democrat are the first radios with the EBF1 in their valve lineup, both were released in September 1936.

Another early proof of the EBF1 is a Philips advert in a 18th of December 1936 issue of Wireless Weekly.

The EBF1 was not often used in Europe.

The EBF1 was mentioned on Feb.1937 in the French radio magazine “La TSF pour Tous” # 145, page 35. See also “TOTALITE DES NOTES”, page 71.

The EBF1 is simply a 6B7 from 1933, fitted with a P8 side contact base and painted red.

 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  ebf1.png
  EBF1: Internet
Miguel Angel Trujillo-Rodriguez
 
ebf1_672.jpg
EBF1: Collection JR
Jacob Roschy

 
au36~~1.png
EBF1: RTT 1974 (Franzis) 13. Auflage
Martin Renz

 

Usage in Models 2= 1936 ; 1= 1937?? ; 1= 1937? ; 2= 1937 ; 2= 1938 ; 1= 1939? ; 1= 1948

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):10


Forum contributions about this tube
EBF1
Threads: 1 | Posts: 1
Hits: 351     Replies: 0
Origin and release date of the EBF1
Jacob Roschy
13.Dec.18
  1

According to RM member Gary Cowans the earliest proof of the EBF1 is found in the Australian receiver “Tasma Tiger 345”, which appeared in an advert from “The Courier-Mail” (Qld.) Oct 9, 1936, page 17. Its the first receiver which has the EBF1 in its valve lineup.

According to RM member Martin Kent the Tasma Tiger & Democrat radios were both released in September 1936.

 

Another early proof of the EBF1 is a Philips advert in a 18th of December 1936 issue of Wireless Weekly.

Since the first appearance of the EBF1 in Europe was not before February 1937, the EBF1 is most likely an “invention” of Philips-Australia.

However, the EBF1 was not a particularly ingenious design. It's simply a 6B7, fitted with a P8 side contact base and painted red.

The ST12 bulb and the heater current 0.3 A fits most to American standards, but not so to the Philips red series.

The picture clearly shows the origin of the EBF1 from the 6B7.

The EBF1 is the only valve in the Philips red series with an American ST12 bulb and a heater current of 0.3 A, as it's just a rebased 6B7.

The EBF2 from 1938 however has the bulb size and shape of the Philips red series, as well a heater current of 0.2 A, which also is typically for the Philips red series.

 

Here is shown an excerpt of a valve data list of Philips France to compare the EBF1 with the 6B7. Since the 6B7 data are only shown for 100 V screen voltage, the data for the 6B8G are added, which is electrically identical.

Probably to disguise the relationship of the EBF1 to the 6B7 and 6B8G, the values of Ia (anode current) and S (gm) are slightly different, with Ia = 9 mA vs. 10 mA, S = 1.1 vs. 1.3 mA/V.

Jacob

Attachments

 
EBF1
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