Re: [Amps] History of Grounded Grid Amplfiers

["Fuqua, William L." <wlfuqu00@uky.edu>]

________________________________
From: Fuqua, William L. <wlfuqu00@uky.edu>
Sent: Saturday, December 12, 2020 11:44 PM
To: Joe Subich, W4TV <lists@subich.com>; amps@contesting.com 
<amps@contesting.com>
Subject: Re: [Amps] History of Grounded Grid Amplfiers

The plate current meter in most AM TXs cannot be in series with B- side of HV 
power supply if it provides multiple elements and modulator.
Often the screen grid bias is provided thru a series dropping resistor from the 
modulated B+ and the modulator is also powered by the same power supply.

73
Bill wa4lav

________________________________
From: Amps <amps-bounces@contesting.com> on behalf of Joe Subich, W4TV 
<lists@subich.com>
Sent: Saturday, December 12, 2020 11:08 PM
To: amps@contesting.com <amps@contesting.com>
Subject: Re: [Amps] History of Grounded Grid Amplfiers

CAUTION: External Sender


On 2020-12-12 10:15 PM, Jim wrote:
 >
> I don't remember if AM transmitters were this way or not.

The RCA BTA-1R out in my garage certainly has the plate current
meter recessed (behind glass).  Schematic shows late current meter
in the B+ line to the finals (parallel 4-400).

73,

    ... Joe, W4TV

ed=0<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.contesting.com%2Fmailman%2Flistinfo%2Famps&amp;data=04%7C01%7Cwlfuqu00%40uky.edu%7C084ac22072bc4ae8e06908d89f1cd435%7C2b30530b69b64457b818481cb53d42ae%7C0%7C0%7C637434293462048689%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=C0w0K24YmTZKa%2Fr%2F660Aht6dvfF4JmQpfYFHDMwoxL0%3D&amp;reserved=0>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps