[ARC5] command set bench psu

[Geoff]

----- Original Message ----- 
From: "Mike Hanz" <aaf-radio-1 at aafradio.org>
To: "Darryl Sage" <trifid284 at gmail.com>
Cc: <ARC5 at mailman.qth.net>
Sent: Friday, January 11, 2013 4:34 PM
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-/140902499334
>
> 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


 So thats what they are! Ive seen them at hamfests over the years usually 
under a table and just ignored them.

At NAS Olathe the AT shop had a more elaborate setup for testing the TX, RX, 
and other assemblies but I dont remember if it was USN custom built or what 
but there was a steady flow of work even in 1960.