Loewe Opta Tubes
Loewe - Opta and Loewe Opta Tubes
3 NF Radio AG DS Loewe
The 3 NF was the world's first integrated circuit. As well as triple tube function it included 5 resistors and 2 capacitors and to prevent contamination of the vacuum within the bulb,these resistors and capacitors were individually sealed inside a glass phial. The developer of the tube was the famous inventor, Manfred Von Ardenne who propogated resistance amplification and laid the groundwork for wide band amplification an important prerequisite for electronc television.
Radio sets with the 3 NF:
1926/27 Local receiver OE333 (old)
1927-31 Local receiver OE333 (new)
1928-32 Local receiver OE333 (Bakelite cabinet)
3 NF Bat Radio AG DS Loewe
3 NF Bat Radio AG DS Loewe
Loewe-radio sets with the 3 NFBat.:
1927-30 Long distance receiver2H3N
1928-32 Local receiver OE333 (Bakelite cabinet)
1928-31 OE 433 Wooden cabinet
1930/31 OE 433 Bakelite cabinet
1928-31 RO 433
1928-31 FE 63
1929/30 FE 65, evt. (FEG65??)
1929/30 FEG 66
1929/32 R 533 G
1930-32 R 645 G
3 NF Net Radio AG DS Loewe
3 NF Net Radio AG DS Loewe
Loewe-radio sets with the 3 NFNet.:
1930-32 EB 100 G
1930-32 R 645 G
1932/33 EB 205 G
1932/33 R 656 G
3 NFK Radio AG DS Loewe
Does anyone have any photographs of these valves? 
3 NFK Radio AG DS Loewe
Loewe-radio sets with the 3 NFK:
1931/32 Long distance receiver 2H3N new, 2H3ND and 2H3NW
1931/32 RK544
3 NFL Radio AG DS Loewe
3 NFL Radio AG DS Loewe
Loewe-radio sets with the 3 NFL:
1933/34 Gotland W und Gotland WL
1933/34 Skagen W und Skagen WL
3 NFW Radio AG DS Loewe
3 NFW Radio AG DS Loewe
Loewe-radio sets with the 3 NFW:
1929/30 R 533 W-old
1930-32 R 533 W (wood) und R 533 W-new
1929/30 FEW 66
1930-32 EB 100 W/110 Volt, EB 100 W/160 Volt and EB 100 W/230 Volt
1930-32 R 645 W
1931? RK 544 D
1932/33 EB 205 W
1932/33 R 656 W
Frey-radio sets with the 3 NFW:
1930 Pantophone 555/3
1930 Odeon 555
Loewe Röhre 2 NF Thanks for the Photo: W. Eckardt Jena
2 HF Radio AG DS Loewe
2 HF Radio AG DS Loewe
The high frequency amplification valve D 2 HF originally from 2 Loewe AR 23-Systems.
Loewe-radio sets with the 2 HF:
1927-30 Long distance receiver 2 H 3 N
1931/32 Long Distance reciver
New Version 2 H 3 N
1928/29 KV 77
1929/30 FE 65, evt. (FEG 65?)
1929/30 FEW 66 und FEG 66
2 HF „New Type“ Radio AG DS Loewe
The 2 HF „New Type“ had two Triodes; their predecessors 2 HF two Tetrodes. intermediate stage was the HF 29. As the "new one Type" served as a substitute for the 2HF the following instruction was given on the license sticker „Without space charge grid! – Plug + 22,5 to 7,5 insert“.
HF 29 Radio AG DS Loewe
The socket wiring was reconstructed
HF 29 Radio AG DS Loewe
An intermediate stage in the development of the of the 2 HF into the HF 30. The second space charge tetrode was replaced by a triode. The tube received a shield coating.
HF 30 Radio AG DS Loewe
HF 30 Radio AG DS Loewe
Loewe-radios with the HF 30:
1928-31 FE 63 and 1929-31 FE 63 (another form)
1931/32 Long Distance receiver 2 H 3 NW
Lindstrom-radio sets with the HF 30:
1929? Pantophone 531, Pantophone 540 E, Pantophone 550 and Pantophone 555
2 HMD Radio AG DS Loewe
2 HMD Radio AG DS Loewe
Loewe-radio sets with the 2 HMD:
1932/33 Super 32
1933/34 Baldur
1933/34 Thule W und Thule WL
1933/34 Vineta W und Vineta WL
Danke für´s Foto: W. Eckardt Jena
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Many thanks to H.-T. Schmidt who has privided information. His homepage provides much more tube data.