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Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
Sulaiman wrote ...
Operating the primary with a little saturation gives some regulation and protection from severe overvoltage.
Do you mean design it to operate a certain margin below saturation? Not familiar with all tranny tech talk, but I thought you were supposed to design it for a higher voltage than what you intend to supply? Sorry if this is exactly what you mean.
Also, if you are powering an 811a or the drop in 542b (or whatever, I can't remember it's number), I would recommend preparing for add-ons. Maybe wind it with two wires instead of one, in case you later want to add more tubes.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Winding for higher secondary (filament) voltage than required is to compensate for "regulation" Basically it's to compensate for IxR voltage drop in both the secondary and primary windings. A typical "regulation" figure is 10% For a 'typical' transformer about 5% is 'lost' in the primary windings and 5% in the secondary windings. So for a 6.3 Vac filament I'd expect to measure about 7 Vac no-load.
As the line/mains input voltage rises so will the secondary voltage (it's a transformer) If the primary runs slightly saturated at nominal input voltage (e.g. 230 Vac) then if the line voltage increases the secondary voltage increases less due to saturation. This way you get maximum power for a given core size with a degree of over-voltage limiting. The transformer will run hot and will buzz/humm quite a bit.
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Winding a Filament Transformer
