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The Svetlana 4CX800A is manufactured in the "Svetlana Electron Devices" (SED) factory in St. Petersburg, Russia. Offered tubes (Soviet marks as GU-74B) are made in the USSR at 1990-92 on this Svetlana factory, are full analogue and have the best parameters rather modern Svetlana 4CX800A tubes. These is military grade tubes have a chromium plating, steadier than nickel plated of modern tubes.
See Svetlana Technical data:
This sale is for TWO (2) Matched GU-74B/4CX800a Tubes NEW and Sealed in original box.
Shipping to U.S. is FAST via Texas
Shipping cost incl. item delivery from Russia to Texas.
This is Svetlana,hihi
00053
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The Svetlana 4CX800A is manufactured in the "Svetlana Electron Devices" (SED) factory in St. Petersburg, Russia. Offered tubes (Soviet marks as GU-74B) are made in the USSR at 1990-92 on this Svetlana factory, are full analogue and have the best parameters rather modern Svetlana 4CX800A tubes. These is military grade tubes have a chromium plating, steadier than nickel plated of modern tubes. 
