[ARC5] command set bench psu

[J. Forster]

In looking at the pics, it seems they might be post-WWII and designed to
service the Type 12 stuff.

FWIW,

-John

===========


> Thanks for the good information!
>
> I got a couple of those; I never realized they were for the ARC-5/SCR-274N
> and later type receivers! I picked up 2 at a hamfest a long time ago for
> $25
> for both. I used them as general bench supplies, for the plate voltage. I
> never used the 24VDC output...
> Since they haven't been used for a while, it's time to dust them off and
> replace the rectifiers and mod them per Mike!
>
> 73, Meir WF2U
> Landrum, SC
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of Mike Hanz
> Sent: Friday, January 11, 2013 4:35 PM
> To: Darryl Sage
> Cc: ARC5 at mailman.qth.net
> Subject: Re: [ARC5] command set bench psu
>
> On 1/11/2013 2:52 PM, Darryl Sage wrote:
>> I saw a command set bench psu . i had to have it more mony than brains.I
>> guess i can retire a few dynos  I have never seen one before are they
> rare?
>> I will have to make room for it now. 73  darryl    ve3cpo
>
> I'm assuming that you are referring to
> http://www.ebay.com/itm/ARC-5-Power-Supply-SCR-274N-Receiver-OEM-/1409024993
> 34
>
>
> I've had a few cycle through here.  I've used them for a while, then
> pass them on to someone who's wanting one.  They have some drawbacks,
> one of which you can see in the photos - the voltages tend to be on the
> high side rather than the low side as we are more and more trying to
> provide for our dwindling supply of command sets.  The selenium
> rectifier used for the low voltage supply should be replaced before it
> replaces you, and the HV bridge diodes could be replaced by four modern
> HV diodes.
>
> You can fix the voltages with a bucking transformer, but if I was
> keeping one, I'd put in a 6082 (24v filament) series regulator on a
> 3"x3" outboard chassis on the back, and design the circuit so that the
> HV switch steps started at maybe 50v and ended up around 220v. There are
> plenty of those circuits in the manuals.  Then it would be pretty
> useful.  It's a shame the nifty cable with the dynamotor connector was
> retained by the seller, but you can cobble one up fairly easily, if not
> as elegant looking.
>
> Congratulations on your purchase - I'm sure you'll enjoy using it!
>
> 73,
>   - Mike
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