A place to ask questions about all transformers


Postby parkhead » Thu Mar 10, 2011 1:29 pm

Can anyone explain which Choke to select to provide the biggest voltage drop between
the main B+ and screen node ... or am I not thinking about the chokes function properly

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Re: Chokes

Postby Brian Wallace » Thu Mar 10, 2011 5:46 pm

A choke with a DCR value higher than 100 ohms will drop more voltage, my RS choke has a 600 plus DCR, but this is not the end all to lowering the screen voltage. You could go as far as setting up a separate B+ feed for the screen to ensure you reach the needed voltage level on your screens.
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Re: Chokes

Postby parkhead » Thu Mar 10, 2011 11:34 pm

thanks I'm doing separate screen supply in my non marshall amps
You've given me a solid idea of what i need
for my marshall project

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Re: Chokes

Postby Roe » Fri Mar 11, 2011 1:56 pm

I guess the 20h/690r works well in amps with high voltage such as the super 100 amps
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