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ID = 31673
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Triode, vacuum   Universal 
Identical to C509 = C509A = 01A
Similar Tubes
Normally replaceable-slightly different:
Other base:
  C509_B4 ; C509_UV
Predecessor Tubes 201A_Philips  

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

Heizung 4,5 - 5,3V/0,25 A; Sättigungsstrom 50 mA; Ruhestrom 10 mA; Anodenspannung 20 - 120 V; Verstärkungsfaktor 9; Durchgriff 11 %; Steilheit 1 mA/V; Innerer Widerstand 9000 Ω; Anwendung: H.A.N.L.; Preis 1927: 19 ATS. Daten aus dem WEKA-Katalog 1927, Seite 163.

Die Röhre wurde auch mit dem B4-Sockel (Philips A34) geliefert, statt mit dem üblichen US-Sockel (Philips G34). Siehe auch Stempelung C509A als gleiche Röhre.

Information source - - Manufacturers Literature   R38H 1-12-1925
Babani, International Radio Tube Encyclopaedia

c509_so.png C509: ARRL Handbook 1972
Anonymous 10 Collector

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Just Qvigstad
C509: own collection
Peter den Boer

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Usage in Models 1= 1928

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of



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