[Amps] When did Grounded Grid begin?

[MU 4CX250B]

Hi Carl, You’ve got lots of great stories. BTW we got our ticket the
same year. I was wn0zke in Kansas City, upgraded to General, then
lived as G5APG in England for a year, then to Ohio as w8kfl. Got my
present callsign sometime in the 1970s. Been active the entire time.
My first wife almost left me because she kept bumping her knees on the
KWM1 in my Corvair. The Corvair is long gone, as is my ex-wife, but
I’ve still got the KWM1.
73,
Jim W8ZR

Sent from my iPhone

> On Dec 21, 2020, at 1:14 PM, Carl <km1h at jeremy.qozzy.com> wrote:
>
> That sounds like the amp that was at the dumpster during Nearfest in the 80's that I dragged home in my workhorse 85 Dodge 3/4 ton van with the long wheelbase. Rohn tower sections fit just fine as I was doiing lots of installs.
>
> Too rough to restore but lots of parts, including PS for a homebrew and the HK-254's in parallel fired right up for 160-20M AM. Those tantalum plates loved to glow almost white. Bill Eitel and Jack McCullough left there in 34 to found Eimac and seriously push tantalum plates.
>
> Carl
> Ham since 1955
>
>
> ----- Original Message ----- From: "Colin Lamb" <k7fm at teleport.com>
> To: "amps" <amps at contesting.com>
> Sent: Friday, December 18, 2020 9:01 AM
> Subject: [Amps] When did Grounded Grid begin?
>
>
>> My 1940 Radio Engineers Handbook dated 1943, by Terman has an grounded grid amplifier.  It also has a not that the design was called the "inverted amplifier" and it came from Electronics, Vol 13, Page 14, July 1940.
>>
>> There is a circuit in my 1937 Radio Handbook that has the meter to measure plate current in the cathode of a parallel HK-254 amplifier.
>>
>> So these circuits may be around long before Orr.
>>
>> Colin Lamb  K7FM
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