[ARC5] Power Supply Filter Question

[Fuqua, Bill L]

  No, the cathode is good for at at least 300vDC

________________________________________
From: J. Forster [jfor at quikus.com]
Sent: Sunday, December 22, 2013 2:40 PM
To: Fuqua, Bill L
Cc: Robert Eleazer; arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question

Yes, but it takes a floatingg heater supply for the pass tube.

-John

==============

>    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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