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Old 16th November 2008, 08:03 PM   #1
Jaap is offline Jaap  Netherlands
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Default heater voltage

I have a transformer with 5V/2A.
I need to feed two 807 tubes (6,3V/0,9A each)

Is it useful/possible to rectify the 5V and will it deliver enough volts/current for the tubes in this way ?
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Old 16th November 2008, 08:48 PM   #2
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you simply dont have enough power in trafo. need 11.34W, and you have only 10W.
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Old 18th November 2008, 10:05 PM   #3
46davis is offline 46davis  United States
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I tried what you're thinking with a couple of current hog 5687s. What I didn't figure on was the more than 1v forward current drop in the big bridge rectifier that more than ate up all the p-p benefit I was hoping to get. Sorry, won't work.
It IS ok to suck a little more than rated current from a heater winding of a p trans if you're not using another of the windings, like the 5v rectifier heater winding.
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Old 18th November 2008, 11:39 PM   #4
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A bridge and boost regulator can give you 6.3V... but not 1.8A - as mentioned, there isn't enough transformer.
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