Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 29016
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Saturation diode   Power-supply 
Identical to 56001
Similar Tubes
Differences not known by us:

Base Rimlock base B8A
Filament Vf 4.6 Volts / If 0.155 Ampere / Direct / Special heater – See text

Saturated diode for use in AC/DC stabilizing circuits. Anode current depends upon the temperature of the tungsten filament and hence on the RMS current flowing in it.

  • 4.6 V - typical filament operation voltage. Typical operating range is between 4.5 and 4.8 V.
  • 150 µA typical anode current
  • 280 µA/V sensitivity of anode current vs filament voltage variation
  • 5.7 V - absolute maximum filament voltage for 0.2 sec.
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
22 x 76 x mm / 0.87 x 2.99 x inch
Information source - - Manufacturers Literature   
56001: Collection JR
Jacob Roschy

More ...
56001: Doc. Philips
Wolfgang Holtmann


from Just Qvigstad

Forum contributions about this tube
Threads: 1 | Posts: 5
Hits: 4475     Replies: 4
seltene Rimlockröhre
Wolfgang Scharschmidt


habe eine seltene Rimlockröhre des Typs 3DA und suche deren techn. Daten.

Kann mir da jemand weiterhelfen?





Jacob Roschy

 Hallo Herr Scharschmidt,

ich kann Ihnen hierzu nur anbieten, dass diese Röhre eine gewisse Ähnlichkeit mit der Röhre 56001 hat, nach Beschreibung eine Sättigungsdiode, zur Verwendung in Stabilisierungsschaltungen.

Grüße, Jacob Roschÿ


Wolfgang Scharschmidt

Hallo Herr Roschy,

zunächst herzlichen Dank für die Info.

Ja, in der Tat, es könnte mit der 56001 passen.

Da hatte man wohl zu Beginn vorgehabt der Röhre die Bezeichnung 3DA zu geben und wegen Verwechslungsmöglichkeit dann davon Abstand genommen. Auf jeden Fall ist die 3DA in keinem Röhrencodex geführt.

Mit freundlichen Grüßen


Jacob Roschy

Hallo Herr Scharschmidt,

freut mich, wenn ich weiter helfen konnte !

Allerdings finde ich die Bezeichnung 56001 kaum weniger als Verlegenheitslösung, wenngleich deutlich weniger verwechselbar.

M. f. G. J. R.

Maarten Bakker

I'm sorry for responding in English, but this topic is a little bit above my German writing skills.

To me, the type designation 3DA looks very much like a prototype or production sample designation, in which case the tube was never intended to be officialy stamped as such. A possible reason for such a designation to be stamped anyway, was by customer demand: the customer wanted the tubes shipped as soon as possible, i.e. before a permanent designation was assigned.

Prototype designations roughly decode as follows:

letter (optional), N and V known
sequential number
heater and system analog to Pro Electron code

So if this really is a prototype designation, it would be the 3rd prototype of an 1,4V heater single diode. Not exactly true but too close to be a coincidence in my opinion.

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]