[Amps] step start

[Val]

Hello Paul,

As you will put the step start circuit in the transformer primary, it 
will limit the transformer inrush current and thus all the voltages 
provided by the transformer - filament, screen, grid, plate.

73, Val LZ1VB


На 01-10-23 в 21:19, Paul Decker написа:
> 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 plate.
> 
> 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.
> 
> Paul
> KG7HF
> 
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