[ARC5] 28 volt transformer question ?

[J Mcvey]

 Well, it might be a great setup in a cold shack. It would get a 25 watt resistor nice and toasty.I did things like that when I was a kid who only had "available materials" to work with. 
Yes, it works, but it's wasting power in the "brave new green world" and rather Rube Golberg-ish.
The variac would be my choice.Better yet, a transformer better suited for the task.

    On Monday, September 7, 2020, 10:47:30 AM EDT, Mark K3MSB <mark.k3msb at gmail.com> wrote:  
 
 I disagree.    If for a receiver,  the current draw is constant and a suitable dropping resistor can be used.    I've done this frequently with ARC-5 receivers.

Or, just put a variac in front of it and drop the input voltage.

Mark K3MSB
On Mon, Sep 7, 2020 at 10:42 AM J Mcvey via ARC5 <arc5 at mailman.qth.net> wrote:

 Using that xfmr with full wave rectification and filter cap would yield about 39 volts out.So, it's a good candidate for the scrap yard.


    On Sunday, September 6, 2020, 11:10:08 PM EDT, Hubert Miller <kargo_cult at msn.com> wrote:  
 
  
I had this AM-FM broadcast receiver, with step tuning, and the logic developed a problem.
 
As you know, these are impractical to repair, with this kind of problem, uneconomical.
 
Well, in my city, there is very limited collection of ewaste, and an irrational I think, regulation
 
of categories. So instead of tossing the whole thing in the garbage, I disassembled it, tossed
 
the cabinet and chassis in the recycle, and the circuit boards in the regular garbage.
I found that the power transformer is 28-0-28 volts and looks good for a steady 5+ amp. What
 
I'm wondering, should I keep this for a dynamotor spinnner, for dynos like the command sets
 
or RU-GF class? With a filter cap, the output should stay "near" 28 volts under load. You just
 
don't want to have such PS charged up to peak and then connect it to the load, which might
 
be hard on tubes. Or what if I just used it without filter cap, to spin a dynamotor? Or instead,
 
go ahead with a multiple thousands mFd filter cap and maybe a small series resistance to
 
adjust voltage under load?  
Many years ago I used such a brute force supply I bought from Fair Radio to power an ARR-15
 
receiver. At that time, I didn't even think to worry about the exact output voltage.
 
So what about this transformer? 24 volts would be preferable but the price on this one was
 
right.
 
-Hue Miller 
 ______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: https://www.qsl.net/donate.html  ______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: https://www.qsl.net/donate.html
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200907/fd980a8d/attachment.html>