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[Amps] step start

Subject: [Amps] step start
From: Paul Decker <>
Date: Sun, 1 Oct 2023 14:19:59 -0400 (EDT)
List-post: <>
Hello all.

I'm building a 4cx1500b amplifier. This is the first tetrode high power 
amplifier I've tried to do.  I'm using about 300V on the screen and 2500 on the 

For my power supply I'm using a 1 Henry choke input on the screen supply 
dumping into 200uF This seems pretty stiff.  For the plate supply it's a 
voltage doubler outputting 2700 V dumping into 93uF.  Not quite as stiff, about 
300V drop under full load. I have plenty of capacitors, so I can add more 
capacitance if needed.

Two questions, 
1. is the plate voltage regulated enough or do I need more plate regulation and
2. for soft start,  Should the soft start bring both the screen voltage and 
plate voltage up or should I let the screen voltage be and just soft start the 
plate voltage.  

Thanks for any insights you all might have. 


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