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Old 9th January 2004, 09:53 AM   #1
jim is offline jim  Belgium
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Default power transformer help !!!

Hi All,

I have two old power transformers salvaged from a Tek 545A 'scope.
I'd like to use them for a power amp project wich uses a vacuum tube rectifier (5U4). The transformer has several 6,3V windings of wich I want to use one for the 5U4. However since a 5U4 is directly heated this would impose 450V on the heater winding wich was originally elevated up to 350V. Do you think this extra 100V could cause any problems ?
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Old 9th January 2004, 10:59 AM   #2
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The transformer will probably handle the extra 100 volts HOWEVER the 5U4 tube has a 5 volt filament as does the 5Y3, 5AR4, etc.
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Old 9th January 2004, 09:59 PM   #3
SHiFTY is offline SHiFTY  New Zealand
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Should be fine, as long as the winding is good for 3A or so. I have sone this with 6.3V windings before, just adding a couple of ~1ohm 5W resistors to either side of the filamet to get it down to 5V.
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