Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 660
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  Double Tetrode   beam power 
Identical to VEL11
Similar Tubes
Heater different:
First year 1947 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
1946 : Funk-Technik (FT) # 2
Jan.1947 : Funkschau # 2
Predecessor Tubes VCL11  
Successor Tubes 1948   UEL11   UEL71  

Base German Steel Y8A, 1938 (Codex=R) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 90 Volts / If 0.05 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Tube prices 5 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

VEL11: Radiomuseum Org
Egon Strampe

vel11_sock.png VEL11: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

Just Qvigstad
VEL11: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

More ...
Usage in Models 1= 1947?? ; 2= 1947? ; 22= 1947 ; 1= 1948? ; 19= 1948 ; 7= 1949 ; 1= 1950? ; 2= 1950 ; 2= 1951 ; 1= 1953

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):58

Collection of



Forum contributions about this tube
Threads: 1 | Posts: 1
Hits: 2202     Replies: 0
VEL11 Tetrode curve families
Joe Sousa

Fellow radiophiles,

I took the following curve families from the VEL11 by Telefunken that came with my Grundig Gloria 51GW.

Tube emission seems pretty good because the power tetrode section is rated to draw 22mA with G1=-6V and G2=200V, and this specification point is met at the far right of the sixth curve from the top in the first plot.

The power tetrode section with 200V and 100V at G2

The detector tetrode section with 20V and 30V at G2

These curves suggest that the detector tetrode is constructed as a classic tetrode, while the power tetrode has no kink and has the sharp knee that is typical of beam tetrodes.

Best regards,


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]