>
>I believe the answer may be found in the geometry of the tube being used.
>About 40 years ago I built a beautiful (for that time) amp using pp 4-400A's
>4" 13x17x4 Aluminum chassis, air system sockets,chimneys, big Johnson jack
>bar with kw coils,swinging link ,3 nice big Triplett meters, all in a black
>crackle desk top rack. Sure worked fine, only had one trouble, XYL couldn't
>turn off the bathroom light when I was on 75M. The screen supply was not
>regulated seems like the big old glass fire bottles didn't need it. > But the
>external anode tetrodes Eimac, Svetlana and others, do need regulation in
>conventional circuitry,
? Provided we are talking about linear operation, 4-400As and 4-250As
benefit as much from a regulated screen as the 8349, the most humungous
ceramic-metal ''tetrode with handles''.
- Rich..., 805.386.3734, www.vcnet.com/measures.
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