Kyllä pääsee, esimerkiksi putken käyttö eri laitteissa
Verwendung in Modellen 3= 1950?? ; 3= 1950? ; 2= 1950 ; 1= 1951? ; 3= 1951 ; 12= 1952 ; 3= 1953?? ; 1= 1953? ; 17= 1953 ; 2= 1954?? ; 2= 1954? ; 19= 1954 ; 15= 1955?? ; 10= 1955? ; 24= 1955 ; 13= 1956?? ; 7= 1956 ;
Vaikka alkuosan valmistusvuodet ovat osittain epävarmoja, on esim Philipsillä useita vahvistimia, joissa on ko putkea käytetty, esim EL6420 vuodelta 1952
http://www.radiomuseum.org/r/philips_80_watt_mischpultverstae.htmlPower output pentode, launched mid 1949 by Philips
Many years after the F443N the EL60 appeared as a new 25 W power output pentode, then as all-glass-tube with the 9-pin "key"(Loktal)-base like the EF50. As this wasn't accepted by the market, one year later it became provided with an octal base and then appeared as this most successful EL34, which is in production up to today. [Jacob Rosch˙, 15 May 2003]
First year 1950 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s) Aug.1950 : Funk-Technik (FT) # 15 ks kuva
May.1949 : -- Original-techn. papers.
Sivu: [1] 
Oy Sähkö Ab - YV70W (Luettu 15693 kertaa)
