[ARC5] Power Supply Filter Question

[Fuqua, Bill L]

   Well,
If you can do it with a power MOSFET you can do it with a 6080.
It will allow as little as about 15 volts drop between plate and cathode with both sections in parallel and at 70ma current.
And you still have a tube power supply.
73
Bill wa4lav

________________________________________
From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on behalf of Robert  Eleazer [releazer at earthlink.net]
Sent: Friday, December 20, 2013 9:04 PM
To: arc5 at mailman.qth.net
Subject: [ARC5] Power Supply Filter Question

Back when I first started learning about boatanchors I read the usual ARRL material that described the classic way to build a power supply: a capacitor, an choke inductor, and a capacitor.  I soon found out how rare and expensive the required inductors were.

I was amused last year when I rebuilt the AC power supply on a BC-348-N.  It was classic - literally right out of the Surplus Conversion Manual - using two fairly low valued high voltage caps and a pretty big inductor.  I used some new, bigger, caps when I rebuilt it but left the inductor in place.  Of course, it was also running the B+ way too high and I added some power resistors in both the AC input line and the B+ line.  Got the B+ from over 250VDC down to about 200 VDC.

Now, we have available high voltage caps that have much larger values that those 20 mfd cans we used to use and are a lot smaller as well.  But I wonder if adding some inductance to the power supply circuit would do some good?  Would winding some wire around a piece of steel or even around a nail provide better filtering than just some big caps?

Thanks,

Wayne
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