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Re: [Amps] step start

Subject: Re: [Amps] step start
From: Victor Rosenthal 4X6GP <>
Date: Mon, 2 Oct 2023 19:33:05 +0300
List-post: <>
Of course I understand that. But I got the impression from the original post that he thought there was some reason to apply plate/screen voltages to the tube slowly.

Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5

On 02/10/2023 17:46, jim.thom wrote:
Date: Mon, 2 Oct 2023 16:42:10 +0300
From: Victor Rosenthal 4X6GP <>
Subject: Re: [Amps] step start

<Why do you want a soft start on either plate or screen voltage? What
<function does it serve?

<Victor, 4X6GP
<Rehovot, Israel
<formerly K2VCO

Switch on a B+ supply with a 93uf filter cap, with no step start, and you
will find out  quickly
why step start is typ used.

What's the DC resistance of the 1 H choke ?  You will want a HD bleeder on
the screen supply at all times.  If sized correctly, the combo of the HD
screen xfmr, choke, 200 uf cap + bleeder should provide ample screen
regulation  for SSB use.   The dynamic regulation should be ample for both
your proposed B+ and screen supply.

Jim   VE7RF
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