Скачать или смотреть Unboxing A Rediffusion ECC81 RF Double Triode Vacuum Tube

Unboxing a Rediffusion ECC81 RF double triode vacuum tube. This valve is probably new & in its original box.
The valve base is a Noval 9 pin, USA pico-9, B9A miniature 9 pin. The clear glass envelope has the Rediffusion logo, REDIFFUSION & ECC81 printed on it in yellow. No date or manufacturing codes are visible on the valve.
The yellow box has the Rediffusion logo, REDIFFUSION & ECC81 printed on both ends. I have other Rediffusion valves in my collection which have "REDIFFUSION PEC" & "PEC REDIFFUSION" printed on the valves & boxes. I do not know what the PEC stands for. I was wondering if it was used by Rediffusion to denote their use of Russian made valves.
The type ECC 81 was first introduced in 1947 for use in television receivers as a RF oscillator, mixer or amplifier. It is also used in audio circuits as a phase splitter & preamp. The ECC81 has a heater filament voltage requirement of 6.3 volts.

For more information on this valve:
http://www.r-type.org/exhib/aav0004.htm (Clairtone ECC81 version)
http://www.r-type.org/exhib/acp0004.htm (Cossor ECC81 version)
http://www.r-type.org/exhib/aai0246.htm (Mullard ECC81 version)
http://www.r-type.org/exhib/aaq0433.htm (Mullard ECC81 version)
http://www.r-type.org/exhib/aaq0437.htm (Mullard ECC81 version)
http://www.r-type.org/exhib/aao0007.htm (Zaerix ECC81 version)
http://www.r-type.org/exhib/aaa0434.htm (Brimar 12AT7 version)
http://www.r-type.org/exhib/aaa0958.htm (Brimar 12AT7 version)
http://www.r-type.org/exhib/acg0055.htm (Brimar 12AT7 version)
http://www.r-type.org/exhib/aaa1811.htm (Mullard 12AT7 version)
http://www.r-type.org/exhib/acl0188.htm (Pinnacle 12AT7 version)
http://www.r-type.org/exhib/aay0061.htm (Sylvania 12AT7 version)
https://www.radiomuseum.org/tubes/tub... (Telefunken ECC81 version)
https://www.radiomuseum.org/tubes/tub... (NEC 12AT7 version)
http://www.vintagehofner.co.uk/galler...

Information on Rediffusion
http://www.rediffusion.info/
https://en.wikipedia.org/wiki/Rediffu...
https://hackaday.com/2018/08/10/redif...

For more information on old stores part numbers:
https://frank.pocnet.net/other/Servic...

Vacuum tube, thermionic valve, electron tube
https://en.wikipedia.org/wiki/Vacuum_...

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Videoed on Tuesday 29th December 2020 © Mike Fairman 2020

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Unboxing Vintage Electronic Components