Jeff Maass wrote:
>
>My club has, courtesy of Ten Tec, a Ten Tec Titan II, which uses
>the Svetlana 4CX1600B. This tube has become expensive and
>scarce, and we are looking for an affordable spare 4CX1600B, or
>an affordable alternative.
>
>I've seen some references that identify the Svetlana GU84B as
>being the military analog, with a bit more dissipation rating, but
>needing more cooling air.
>
Some of these cross-references are vague to the point of being
misleading (for example, some people call the GS35b a "Russian 8877",
which it certainly isn't).
www.nd2x.net is the best source for data on Russian tubes, and it also
features practical amplifiers. Data sheets are at:
http://www.nd2x.net/tube-1.html
The 4CX1600B data sheet is on the Svetlana site, at:
http://www.svetlana.com/graphics/products/pdf/4CX1600B.pdf
>Are they pin compatible?
The four grid pins look similar, but the central heater connection looks
slightly different.
>Can the GU84B be used in a 4CX1600B
>amp without (or with) modifications?
"Maybe with" seems to be the answer.
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek
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