TUBES


The Radio Valve Company of Canada (RVC) was incorporated in November 1922 and it manufactured vacuum tubes under the trade name "Radiotron".  These tubes were distributed to the radio trade excusively by the Canadian Marconi Company and Canadian General Electric.
q_tube_1.jpg
Marconi 'Q' Tube (See credit #2)

Introduced in 1916, this is  triode with widely positioned leads to minimize inter-electrode capacitance. It was a high impedance tube, used primarily as a detector. Like all early Marconi valves, it was made originally by Edison Swan  but after 1919 by M-OV. 

v24_tube.jpg
Marconi 'V24' Tube.  (See credit #2) 

This tube, a directly heated triode, was a development of the 'R' type aimed at improving high frequency performance. The V24 was introduced in 1916 and was used as an RF amplifier. Filament needs 3 volts at 0.7 Amps with an anode voltage of 24 volts, hence the name V24.  This tube, although made in the UK  may have been used by Canadian Marconi in their radios.


 
 
12a_tube.jpg
Type 12A triode (Ebay photo)

 
1c21_tube.jpg
1C21 Thryatron 

 
1625_tube.jpg
1625 beam power tetrode 
832_tube.jpg
832A transmitting tetrode
6sn7_tube.jpg
6SN7 dual triode
12av6_tube.jpg
12AV6  Double diode and triode
12sa7_tube.jpg
12SA7 - Sincle ended series example
All photos in this table by Pierre Lewis

 
marconi_tubes_6l5.jpg
6L5G Power Triode Amplifier 
marconi_tubes_12bz7.jpg
12BZ7 high-Mu twin triode 
marconi_tubes_6397.jpg
6397- Power Amplifier Pentode 
marconi_tube_1a.jpg
Might be a 1A5 but the box is very historical.
6af6.jpg
6AF6 miniature, octal, magic eye tube.
All photos in this table via E-bay

 
12sc7.jpg
This photo illustrates the markings on tube boxes supplied  to the military. The 12SC7 is a hi-Mu twin triode. (E-bay photo)

 
marconi_tube_carton.jpg
A more contemporary tube carton. (E-bay photo)

 
6204_tube.jpg
This 6204 tube with a blue finish was never registered, but it is a 6.3 volt, half wave rectifier that is equivalent to one half of a type 6X5. 

The 5961 tube, also painted blue is described as as "Canadian reliable 6SA7".

Marconi made a 6006 tube whose finish was red. This is identified as a "ruggedized remote cutoff pentode (Canadian) version of the 6SG7". 

The 5961 and 6006 tubes mentioned above were referenced from : MIL-HDBK-213, "Electron Tubes Interchangeability Directory" published by the United States Department of Defense and dated November 02, 1959
Contributors and Credits:

1) Pierre Lewis <leware(at)videotron.ca>
2) V24 and 'Q' photos by Ben <benam(at)rogers.com>
3) V24 Description http://www.r-type.org/exhib/aaj0135.htm
4) http://www.oneillselectronicmuseum.com/largephotos/decorphoto/marconiad1a.jpg
5) http://www.g3ngd.talktalk.net/marconi.html
6) http://www.r-type.org/articles/art-002.htm#03
7) Tom Brent <navyradiocom(at)gmail.com>
8) “The Early Development of Radio in Canada 1901-1930 by Robert Murray”.
9) Jim Cross <jimcross(at)cfl.rr.com>


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Sept 25/17