Скачать или смотреть Unboxing A GEC Z77 EF91 RF Screened Pentode Vacuum Tube

Unboxing a G.E.C. (General Electric Company) Z77 EF 91 R.F. high gain, screened pentode vacuum tube. This valve is probably new & in its original box. (NOS New Old Stock, NIB New In Box). The valve base is a miniature 7 pin base B7G & has no top connector cap. The clear glass envelope has a G.E.C. MADE IN ENGLAND label. Printed on the glass inside a rectangle is Z77/EF91, MK & 9. Moulded in the center of the glass base is a number 17 & a letter J between pins 1 & 7.
Printed on 3 sides of the box is G.E.C. VALVE. Printed on the 4th side is the BVA logo, 17/6, P. TAX EXTRA, MADE IN ENGLAND & THE GENERAL ELECTRIC CO. LTD. OF ENGLAND. One end of the box has Z77/ EF91 printed on it with DO NOT DESTROY THIS CARTON. IT IS A VITAL RAW MATERIAL. SAVE FOR SALVAGE.on the inside flap. Printed on the other end of the box is OPEN OTHER END AND PUSH UP CONE. Printed on the inside flap is E S & A ROBINSON LTD, BRISTOL ENGLAND & BT11F. Also in the box was a small guarantee leaflet (VF 33).
The type Z77 was first introduced in 1947 & has a heater filament voltage of 6.3 volts.

For more information on this valve:
http://www.r-type.org/exhib/abh0259.htm (GEC Z77 version)
http://www.r-type.org/exhib/aaa1874.htm (Marconi Z77 version)
http://www.r-type.org/exhib/aam0039.htm (Marconi Z77 version)
http://www.r-type.org/exhib/aam0052.htm (Marconi Z77 version)
http://www.r-type.org/exhib/abn0019.htm (6202 EF91 version)
http://www.r-type.org/exhib/aai0307.htm (GEC EF91 Z77 version)
http://www.r-type.org/exhib/aam0066.htm (Marconi EF91 Z77 version)
http://www.r-type.org/exhib/aaa0215.htm (Mullard EF91 version)
http://www.r-type.org/exhib/abh0130.htm (Mullard EF91 version)
http://www.r-type.org/exhib/abh0134.htm (Mullard EF91 version)
http://www.r-type.org/exhib/aad0096.htm (Brimar CV138 version)
http://www.r-type.org/exhib/aaa1882.htm (Unknown CV138 version)
http://www.r-type.org/exhib/abh0016.htm (Unknown CV138 version)
http://www.r-type.org/exhib/aaa0248.htm (Cossor 6AM6 version)
http://www.r-type.org/exhib/abh0132.htm (Cossor 6AM6 version)
http://www.r-type.org/exhib/abo0131.htm (Emitron 6AM6 version)
http://www.r-type.org/exhib/aay0038.htm (Mullard 6AM6 version)
http://www.r-type.org/exhib/aaa1891.htm (Mazda 6F12 version)
http://www.r-type.org/exhib/aaq0070.htm (Mazda 6F12 version)
http://www.r-type.org/exhib/aad0097.htm (Brimar 8D3 version)
http://www.r-type.org/exhib/aaq0242.htm (Brimar 8D3 6AM6 version)
https://www.radiomuseum.org/tubes/tub... (CV138 version)
https://www.radiomuseum.org/tubes/tub... (Siemens EF91 version)
https://www.radiomuseum.org/tubes/tub... (Z77 version)
https://www.radiomuseum.org/tubes/tub... (6AM6 version)
   • Unboxing A CV138 KB/EN (EF91) Pentode Vacu...   (CV138 version)
http://www.r-type.org/pdfs/z77.pdf (Marconi Z77 Datasheet Pdf)
http://www.r-type.org/pdfs/ef91-1.pdf (Mullard EF91 Datasheet Pdf)
http://www.r-type.org/pdfs/cv138.pdf (CV138 Datasheet Pdf)

General Electric Company
https://en.wikipedia.org/wiki/General...
https://www.britishtelephones.com/his...
http://www.r-type.org/ephemera/ephe01...

BVA The British Radio and Valve Manufacturers' Association
https://en.wikipedia.org/wiki/British...

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

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

Unboxing video of vintage electronic components.To watch more vacuum tube videos please click on the link below
Playlist:    • Unboxing Vintage Electronic  Components In...  
Videoed on Tuesday, 1st March 2022 © Mike Fairman 2022 Worcester

Thank you for watching.
If you would like to make a donation to my channel or buy me a drink please click on the link below
https://www.paypal.me/MikeFairman
Thank you for your kindness & generosity.

#UnboxingVintageElectronicComponents
Unboxing Vintage Electronic Components