Re: Grounded grid VHF front-end

john larkin <JL@gct.com> wrote:

On Sat, 09 Nov 2024 16:48:10 -0500, Joe Gwinn <joegwinn@comcast.net>
wrote:

On Sat, 09 Nov 2024 23:23:59 +0000, Dan Green <dhg99908@hotmail.se>
wrote:
[...]

I know a lot of receiver designers, and the older ones are all Hams.
>
Joe

>
+1
That's where all the expertise is. Esp. with tubes.

Unfortunately there are a lot of people working with valves who aren't
engineers and simply cobble together circuits based on myths, legends
and 'golden ears'.  The voices of the real engineers who understand
valves are lost in a din of technobabble.

Tubes are noisy. There are MMICS with NFs below 1 dB.

There are quiet valves (Nuvistors) and noisy transistors (many),
engineering is a matter of chosing the right ones or using them in a way
which minimises the noise or makes it less significant in the overall
design.

--
~ Liz Tuddenham ~
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