>Hello, I just subscribed to the list. I am new to high power, and have a
>Titan 425 gold #49, (supposedly 2nd to last Titan 425 made by TT.) I am
>probably only at the 2nd grade level as far as completely understanding
amplifiers
>(HI HI), but I was listening on 40 meters last night to some "radio rumors",
when
>someone asked if there was a cheaper replacement tube for the 3CX800a7.
>Someone came back said "Sure, get some new sockets and get a pair of 4CX800A
's and
>drop them in there. I jumped in and reminded them that they were comparing a
>triode to a tetrode, and you would have to re-engineer the amp with a screen
>supply etc. He said " No you don't, when you install the new sockets, just
tie
>the grids and screens together, and it'll work. This sounds completely
>bogus to me, but I'd like your take on this Rick.
** Since c. 75% of the grid current in a G-G connected-tetrode flows in
the control grid, and the 4cx800A has a 2w grid -- which is plenty for
Class AB1, I would not operate a 4cx800A in G-G. Instead, I would go
with AB1.
cheers, Todd
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