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Search term used: auto buck Search these results:

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 Forum: Electrical/Mechanical Repair and Restoration   Topic: Bucking Transformer VS Power Resistor Today's Line Voltage

Posted: Oct Sun 04, 2020 7:27 pm 

Replies: 25
Views: 4421


For completeness, there is also "Auto-Buck":
https://antiqueradios.com/forums/search ... mit=Search

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Wed 16, 2020 8:16 pm 

Replies: 18
Views: 1600


Ahhhh---nothing like a good semantics debate to round out the day.....;) First---since I invented** this approach, I can call it anything I like.....n'est-ce pas??? All seriousness aside, this set indeed does not now have a "bucking transformer"----it has a factory transformer with an adde...

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Wed 16, 2020 12:12 pm 

Replies: 18
Views: 1600


Many ways to think of it....

the primary and the buck winding are IN phase---therefore, their voltages ADD to get the supply voltage
Attachment:
buck_wiring.jpg
buck_wiring.jpg [ 67.49 KiB | Viewed 1445 times ]

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Wed 16, 2020 11:23 am 

Replies: 18
Views: 1600


PS: "in series, in phase" IS the bucking connection.....

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Wed 16, 2020 11:18 am 

Replies: 18
Views: 1600


"in series---in phase". That's the plan. I don't see how the overall dissipation will be be adversely affected. I see it as equivalent to simply increasing the number of turns in the primary. To be sure, that does increase resistive losses. German PTs marginal? I have yet to see the PT get...

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Tue 15, 2020 11:36 pm 

Replies: 18
Views: 1600


I prefer to call it a "defensive maneuver". I did not want to get the set all done and then decide I needed a bucking transformer. As found, the set did not give me the choice of turning a switch to correct for the actual line voltage.

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: Re: "Auto-Buck"
Posted: Sep Tue 15, 2020 5:14 pm 

Replies: 18
Views: 1600


... of genuine Telefunken transformers---this one could have been intended for sets to be sold in the US. I had considered putting a tap in the buck winding, so as to have more control---but I got lazy. If the voltage comes out on the low side, I can adjust the series resistor that gets added ...

 Forum: Electrical/Mechanical Repair and Restoration   Topic: "Auto-Buck"

 Post subject: "Auto-Buck"
Posted: Sep Tue 15, 2020 3:03 pm 

Replies: 18
Views: 1600


... first things I found was the multi-voltage PT replaced with one marked "110 only". If I had left this alone, I might have had to add a bucking transformer later. Another "feature" of this transformer was that the leadouts were nothing more than the small-gauge winding wire. ...
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