Re: Grounded grid VHF front-end

"Jan Panteltje" <alien@comet.invalid> wrote in message news:vgq37s$oo9h$1@solani.org...

On a sunny day (Sun, 10 Nov 2024 09:51:49 -0000 (UTC)) it happened Cursitor
Doom <cd999666@notformail.com> wrote in <vgpvnk$ao84$1@dont-email.me>:
>

On Sat, 9 Nov 2024 21:40:06 +0000, Liz Tuddenham wrote:
>

Cursitor Doom <cd@notformail.com> wrote:
>
[...]

There's not a single person on this group today who can really add any
value here.

>
You do them a dis-service, there are some people here who can think with
an open mind.  Even if the ideas they come up with wouldn't work, trying
to find out or explain why they wouldn't work is a good exercise and may
lead to a better solution than just asking hams what they have done
before.

>
OK, that's entirely your call. But I think you'll find the number of
people here with expertise in VHF receiver design is zero and the
proportion of those with an adequate familiarity with designing for toobz
is a vanishingly small subset of that figure. :)
>

>
I designed plenty of VHF rx stuff, teefee works in that range,
including UHF.
But to go back in time and do it with toobs? No, I used transistors.
Only case I could think of for using toobs is when all semi-conductors
were destroyed by radiation.
But not much would be on air to listen for in that case.
And in that case shortwave would be a better place to listen for remaining lifeforms.
And grounded grid does not make a lot of sense, has not many advantages for a VHF input stage.

Why?
https://www.google.com/search?&q=valve+fm+tuner&udm=2
I can see at least two grounded grids and I don't recall a transistor FM tuner without a grounded base first stage.
Reduced sensitivity was ofted caused by a need to replace that transistor because being the first stage it gets what the antenna
gets.