The Hp23 has a plate voltage of 820v , The max plate voltage for the the 1625 is 750V, but the other components were not designed for this potential. resistive dividers would dissipate greater than 50 watts! So, not an option in this case. The variac may be the best choice if you have one beefy enough to handle the wattage.

I assume you are going to run a separate power supply for the filaments? Are they still at 24volts series-parallel or was this T-22 converted to 12v?  I recall that DC is required because of oscillator circuit (1625) uses the filament in the feedback loop.

Do you have the MD7 modulator? That would simplify things greatly.


On Monday, February 24, 2025 at 05:03:08 PM EST, Russ Tine via ARC5 <[email protected]> wrote:


Thanks for all of the advice!
I will begin experimenting with the HP23 and Variac.

73,

Russ K1RWT

On Monday, February 24, 2025 at 02:12:39 PM EST, [email protected] <[email protected]> wrote:


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Today's Topics:

  1. Re: Power Supply for ARC5 transmitters (Dennis Monticelli)


----------------------------------------------------------------------

Message: 1
Date: Mon, 24 Feb 2025 11:11:47 -0800
From: Dennis Monticelli <[email protected]>
To: kgordon2006 <[email protected]>
Subject: Re: [ARC5] Power Supply for ARC5 transmitters
Message-ID:
    <CADgAsSRUzmGOfehfp9Zs8WB8n+qnRF7Hjc2ZhO7cHzZ1zf08Mg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

You could always put a variac on the HP-23 and use a separate transformer
for the filaments.  That way no mods and no wasted power either.

On Mon, Feb 24, 2025 at 11:09?AM kgordon2006 <[email protected]>
wrote:

> Many of you may find the information on this page to be helpful:
>
>
> Ken W7EKB
>
> Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
>
>
> -------- Original message ???---'
>
> On Mon, Feb 24, 2025 at 12:20?PM Russ Tine via ARC5 <[email protected]>
> 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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