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ID = 829
Brand: Common type Europe tube/semicond.
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to KBC1 = TKBC1 = BDDT61 = MKBC1
Similar Tubes
Other base:
  DDT2 ; DDT2B ; KBC1_5pin ; KBC1_UX6 ; KBC32
First year Nov.1934 Ad for a model in Nov. 1934, Australia.
First Source (s)
Mar.1935 : Philips Bulletin # D24
Nov.1938 : Funk 1938 #21
Successor Tubes 1940   DBC21   DAC21   DBC21_9pin  

Base Europe side contact P8A (Au P, 8SC) (Codex=Su) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =

EE: An ad November 30th 1934 in "Radio & Electrical Merchant" Australia shows a battery console model 46 Challenger with KF2, 1C6, KF2, KBC1, B217 and B240. It is not unlikely that this model could not be delivered until the tube was on market in 1935. Many months before the official market introduction, some manufacturers get pre series examples to build circuits with them ...

Text in other languages (may differ)
Tube prices 4 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

KBC1: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

41_1.png KBC1: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
KBC1: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

More ...
Usage in Models 1= 1934 ; 1= 1935?? ; 24= 1935 ; 3= 1936?? ; 8= 1936? ; 37= 1936 ; 1= 1937?? ; 4= 1937? ; 39= 1937 ; 1= 1938? ; 39= 1938 ; 2= 1939?? ; 6= 1939? ; 39= 1939 ; 1= 1940?? ; 1= 1940? ; 13= 1940 ; 1= 1941? ; 5= 1941 ; 1= 1942 ; 1= 1944? ; 1= 1946 ; 1= 1949

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):230

Collection of



Forum contributions about this tube
Threads: 1 | Posts: 3
Hits: 3694     Replies: 2
Stuart Irwin


I notice that this valve is listed as being available from March 1936.  However, I have an article from "Radio & Electrical Merchant" (Australia) dated 30/11/34 that mentions this valve.  Please refer to the attachment.  Any comments?


Stuart Irwin


Ernst Erb

Dear Stuart
Great find! You are by far the most active member in Australia and your colleagues can be thankful that you have done so much for an Australian radio catalog. Congratulations!

I have made corrections for the tube (valve) but I'm not sure if it is the same base and base connections as here in Europe? Have you any idea how we can find out?

It is naturally possible that the set could not be sold until March 1935 but circuit and chassis could have been made by using the usual pre-series tubes received ... Or that Australia was then the test market for that.


Stuart Irwin

Dear Ernst,

Thank you very much for your kind comments.  The KBC1 was available only with the P base in Australia.  The other European valves used in this radio were available with USA type bases in Australia but I can't say with absolute certainty that the ones included in the model 46 are so fitted.

Some European P base valves were manufactured in Australia by Philips with octal bases fitted but these didn't come out until the late 1930s.  They had a "G" suffix added; eg. KL4G.



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