[Amps] GI7B longevity

[john <johnmb@nc.rr.com>]

Anyone have any first hand experience with the longevity of a the Russian 
GI7B tube in HF service? I converted a GSB1000 to a single GI7B unit, and 
it seems to make a very nice compact 450W amp.  I do have a cooling 
enclosure and am using the large muffin fan that came with the unit, albeit 
slowed down some from supersonic blade speed.

Thanks
John K5MO

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