TUBESTHis document is intended to show case a small cross section of tubes used in early radio equipment.
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 (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.
Filament: 6 VDC @
'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 by Marconi UK and was used as an RF amplifier.. Filament needs 6 volts at 0.7 Amps with an anode voltage of 24 volts, hence the name V24.
|A more detailed view of the V24 tube. So far, there is no evidence to show that any of these tubes were manufactured in Canada earlier than the latter part of 1921 according to Radio Trade Builder magazine ,December 1934.(Photo by Lewis Bodlin)|
|This is an adapter for socketless tubes such as the V24. (Image provided by Lewis Bodkin)|
|This adapter for socketless tubes would have been used in radios that employed the breadboard techique of fabrication. Image provided by Lewis Bodkin)|
|This adapter facilitates the mounting of a socketless tube in a horizontal position. (Image provided by Lewis Bodkin)|
|Type: UV-201 receiving
Filament - Pure tungsten. 5 volts@ 1 amp.
Plate Voltage ?
Amplification factor: ?
Comment: The UV prefix indicates a base with four short pins.
Introduced in 1922, the UV201A uses a thoriated tungsten filament which only draws 250 ma. (Photo by Louis Bodkin)
1930s or LATER
|Type 12A triode (Ebay photo)|
|1625 beam power tetrode|
|832A transmitting tetrode|
|6SN7 dual triode|
|12AV6 Double diode and triode|
|12SA7 - Sincle ended series example|
|All photos in this table by Pierre Lewis|
|6L5G Power Triode Amplifier|
|12BZ7 high-Mu twin triode|
|6397- Power Amplifier Pentode|
|Might be a 1A5 but the box is very historical.|
|6AF6 miniature, octal, magic eye tube.|
|This example of a 12SC7 tube, was built under contract and was common to all the Canadian Forces. The 12SC7 is a hi-Mu twin triode. (E-bay photo)|
|This 5961 tube, packaged generically, was built specifically for the RCN in February 1959. (Photo by Tom Brent)|
|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|
|A more contemporary tube carton. (E-bay photo)|
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
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>
10) Lewis Bodkin <05bodkin555(at)gmail,com>
11) V24 and Q tube specs: Scientific Experimenter March 1921
12) Lewis Bodkin <05bodkin555(at)gmail.com>
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