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ID = 61969
Brand: Standard Radiofabrik A.B.; Ulvsunda
Tube type:  Vacuum Pentode   Audio Frequency 
  Ca. 1925 up to 1945 very rare. ***
Identical to S310A
Similar Tubes
Heater different:
  328A ; S328A
Other base and other heater:

Base 6-Pin-Base U6A, old, USA Top contact with a cap.
Was used by Telephony
Filament Vf 10 Volts / If 0.32 Ampere / Indirect / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
x 124 x 38 mm / x 4.88 x 1.50 inch
Weight 40 g / 1.41 oz
Information source Babani, International Radio Tube Encyclopaedia   Page 32
- - Manufacturers Literature   September 1950
S310A: own tube collection
Hannu Alho


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