[Amps] Question for R. Measures

[R.Measures]

>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