[ARC5] Power Supply Filter Question

Mon Dec 23 13:20:30 EST 2013

  Remind me, are those the ones with graphite plates?
73
Bill wa4lav

________________________________________
From: Geoff [geoffrey at jeremy.mv.com]
Sent: Monday, December 23, 2013 12:04 PM
To: Fuqua, Bill L; jfor at quikus.com
Cc: arc5 at mailman.qth.net; Robert Eleazer
Subject: Re: [ARC5] Power Supply Filter Question

I often use a 6336A if I need more headroom, it is a 6080 on steroids.

Carl

----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: <jfor at quikus.com>
Cc: <arc5 at mailman.qth.net>; "Robert Eleazer" <releazer at earthlink.net>
Sent: Sunday, December 22, 2013 10:34 PM
Subject: Re: [ARC5] Power Supply Filter Question

> naturally a 6AS7 will work as well.
> ________________________________________
> From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on
> behalf of Fuqua, Bill L [wlfuqu00 at uky.edu]
> Sent: Sunday, December 22, 2013 10:33 PM
> To: jfor at quikus.com
> Cc: arc5 at mailman.qth.net; Robert Eleazer
> Subject: Re: [ARC5] Power Supply Filter Question
>
> I should say the filament to cathode is good for 300 volts DC and he is
> wanting around 200VDC.
> Use the tube as a cathode follower and voltage divider on grid to set the
> output. You can even add
> a capacitor between grid and ground for additional active filtering.
>
> 73
> Bill wa4lav
>
> ________________________________________
> From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on
> behalf of Fuqua, Bill L [wlfuqu00 at uky.edu]
> Sent: Sunday, December 22, 2013 10:26 PM
> To: jfor at quikus.com
> Cc: arc5 at mailman.qth.net; Robert Eleazer
> Subject: Re: [ARC5] Power Supply Filter Question
>
>  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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>
>
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