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 Post subject: Mystery power supply
PostPosted: Apr Fri 24, 2020 4:40 am 
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Joined: Dec Sat 24, 2011 9:17 pm
Posts: 6222
Location: Vancouver Island, Canada
The tags on the Canadian Hammond transformers read 25249 and 25890. However I can't find any info on various Hammond websites, not surprising if no longer being kept in inventory.

Can anyone speculate what it was used for? It is for sale near me for about $35 US.


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 Post subject: Re: Mystery power supply
PostPosted: Apr Fri 24, 2020 5:57 am 
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Joined: Jul Fri 18, 2008 10:02 am
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Location: near ST Louis Mo 62002
Most likely a power supply , with all those test points for a transmitter or amp .

You need to post some bottom photos , to see if 5 or 6.3 is wired to the tube sockets, so we can determine the rectifier tubes .

http://www.bunkerofdoom.com/xfm/hammond74/Hammond74.pdf

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 Post subject: Re: Mystery power supply
PostPosted: Apr Fri 24, 2020 6:14 am 
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Location: Vancouver Island, Canada
The seller says it is wired for 80 or 5Z3, I think he means 5Y3 or similar octal 5 volt rectifier.
It looks like it was somebody's pride and joy at one time.

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Burl Ives, RIP, oldtimer.
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 Post subject: Re: Mystery power supply
PostPosted: Apr Fri 24, 2020 3:02 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3531
Location: Seattle WA US
It looks like only the transformers, two electrolytics and the chassis remain from the original application. All those jacks and the tube sockets mounted on the topside of the chassis were added by a prior owner. Notice all the chassis cutouts where other components once lived.

The chassis could have come from a small transmitter, or perhaps a vacuum tube organ. Look for heavy gauge (12 or 14) leads on the filament winding on one of the transformers indicating availability of a high current winding.

The transformer nameplates indicate they are only rated for 112VA, but at 25 cycles. They would run cool at 60 cycles (Hz).

Value depends on your need for big transformers with the particular combination of windings offered in this chassis. ( I have a bunch of big transformers that I can't give away !!) I wouldn't offer more than $15 for the two transformers plus choke. The rest is scrap.

-Chuck K7MCG


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 Post subject: Re: Mystery power supply
PostPosted: Apr Sat 25, 2020 1:07 am 
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Location: Tucson, Arizona U.S.A.
In the condition it is in right now, it looks like an experimenter's bench power supply. What it was originally, who knows.

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 Post subject: Re: Mystery power supply
PostPosted: Apr Sat 25, 2020 8:36 pm 
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Joined: Dec Sat 24, 2011 9:17 pm
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Location: Vancouver Island, Canada
Right, it could sit on my bench for $35 but then I'd have to use it for something other than a doorstop.
I was thinking it has value but not to me anymore.
Last move, I sold a trunk load of salvaged transformers for $80 and was happy to tell them all goodbye. :lol:

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Burl Ives, RIP, oldtimer.
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