[ARC5] ARC5 Power Supply .JPGs attached
Ken Gordon
kgordon2006 at frontier.com
Tue Feb 25 11:17:43 EST 2025
So far. so good, Russ. I think that the HP-23/Variac for HV and a sepatate 24 DC supply for
filaments is the best solution, so far.
Of course, you will need various voltage dividers for the oscillator (200 VDC) and final
screens. (270 VDC), but that is relatively trivial to accomplish from the HP-23.
Voltage-regulating the oscillator voltage is a good idea. A pair of VR-105s or appropriate
Zeners would work fine.
550 VDC for the finals is about 69% of the HP-23's 800 VDC output. 69% of the 300 VDC
from the HP-23 is 206 VDC which is almost exactly what you want for the oscillator. Use
Zeners here if you want to regulate that voltage.
For the final screens, you will have to use a resistive voltage divider from the HP-23's +HV.
Dave Stinson's supply would be perfect.for this. Use his volrage divider set up and the
HP-23's HV with Variac. Perfect.
A pair of screens in the 1625s requires about16 mA at 270 VDC.
See attached .JPGs. The 24 V supply really should be DC not AC though.
Carry on.
vy 73,
Ken W7EKB
On 25 Feb 2025 at 14:12, Russ Tine via ARC5 wrote:
>
> Lots of great info here!
>
> Some info I should have mentioned in my original post;
>
> My T-22 is in excellent unmodified condition therefore it still has a
> 24 volt filament string. I have a 24 volt power supply which is
> capable of supplying more than enough current. I had originally built
> a HV power supply using a transformer with a 5U4 for rectification. A
> PI filter and various capacitors and resistors to provide the
> necessary voltages. Unfortunately once I keyed down, the voltages sank
> like a rock. Some design issues unfortunately, which then led me to
> think about the Heathkit PS.
>
> In any case I will be printing out these responses and items in the
> links for further review. At this point the Variac solution is what I
> will try first. If that goes well I will need to work on my original
> PS.
>
> Many thanks to all and 73,
>
> Russ K1RWT
>
>
>
> On Tuesday, February 25, 2025 at 02:20:40 AM EST,
> <arc5-request at mailman.qth.net> wrote:
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> 1. Re: HP 23 for ARC5 (Jim Pruitt)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 24 Feb 2025 23:20:02 -0800
> From: Jim Pruitt <jpruitt67 at gmail.com>
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] HP 23 for ARC5
> Message-ID: <0648cc4a-fd03-458d-bbf2-4b0c74542ce3 at gmail.com >
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hello Russ
>
> You might consider building a power supply like this:
> http://www.arrl.org/files/file/Technology/tis/info/pdf/60hb215.pdf
>
> Diodes can be used in place of the 5U4 tube.
>
> This site built a power supply using a Stancor P8622 isolation
> transformer like this one:
> https://www.onlinecomponents.com/en/productdetail/stancor/p8622-126311
> 83.html?srsltid=AfmBOo
> rrFqyW2Mpmn3MWHlJGuu7G3L9B7BhCS-KsgQiZdfK7MlBXCzPn
>
> A picture is at:
> amfone.net/Amforum/index.php?action=dlattach;topic=27790.0;attach=2640
> 3;image
>
> and the discussion is here:
> http://amfone.net/Amforum/index.php?topic=27790.0
>
> He did not give a schematic but it is a simple power supply.
>
> Good luck.
>
> Jim Pruitt
> WA7DUY
>
> On 2/24/2025 9:18 AM, Russ Tine via ARC5 wrote:
> > Hi Folks,
> >
> > I'm new to the list, and I am looking for some advice about using an
> > HP 23 power supply for my T-22.
> >
> > I still use the power supply for my HW 101, so I do not want to make
> > any mods to the PS itself, I would rather add a voltage divider
> > external to the PS that I could plug in for the T-22 and remove for
> > the HP 23.
> >
> > Thanks in advance and 73,
> >
> > Russ Tine K1RWT
> >
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