[Boatanchors] P&H LA-400 linear

[Ron VE8RT]

I'd have to go out to the shed to get one and take a look, it might be
that if the connection to the suppressor is inside the envelope that it
might be visible.

   Ron VE8RT

On Fri, 16 Aug 2019 02:19:19 -0500
Robert Downs via Boatanchors <boatanchors at mailman.qth.net> wrote:

> One subject that I don't recall being mentioned in this thread but that has
> been in almost every similar thread in the past is that some if not most of
> these 200 watt nominal linears using four 807's or four 1625's are wired as
> grounded grid amps.  And that the beam forming plates inside the tubes that
> must be grounded are electrically connected to the cathode, not brought out
> to a separate pin.  So stock tubes apparently won't work but must be
> modified.  I never paid that much attention to the threads but seems like at
> this point most threads split off into which brands of tubes could be
> modified and which couldn't.  Some 1625's apparently had the cathode and
> beam forming plates electrically connected inside of the tube envelope and
> cannot be modified.  Some had the connection made inside of the tube bases
> and can be.  I've long ago forgotten which brands could and which couldn't.
> And why the grounded grid configuration was preferred over the conventional
> grounded cathode.
> 
> Robert Downs
> 
> 
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-- 
Ron VE8RT <ve8rt at yknwt.ca>