Quick OT Question

Bobby Dipole · 12th September 2011, 08:03 PM

I've done a lot of audio work during my career, but nothing with transformers. If I remember correctly from school (assuming ideal lossless components), the voltage swing across the primary of an OT will be twice the B+/Vcc voltage when driven fully. Is this correct?

With a push-pull output, would both half cycles derive the same voltage boost? (This would certainly be a power advantage with twice the voltage swing!)

I have a little project here, replacing the #19 (dual triode) output tube on an antique radio console with a pair of high voltage power mosfets. I hate to spoil the radio's originality, but this tube's audio just stinks! Even my AA5s sound much better.

Bobby Dipole

tomchr · 12th September 2011, 08:54 PM

For SE, the energy stored in the inductance of the OPT primary will cause the voltage across the primary to be almost 2*B+ when the output stage is driven fully.

~Tom

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12th September 2011, 08:03 PM	#1
Bobby Dipole diyAudio Member Join Date: Oct 2010	Quick OT Question I've done a lot of audio work during my career, but nothing with transformers. If I remember correctly from school (assuming ideal lossless components), the voltage swing across the primary of an OT will be twice the B+/Vcc voltage when driven fully. Is this correct? With a push-pull output, would both half cycles derive the same voltage boost? (This would certainly be a power advantage with twice the voltage swing!) I have a little project here, replacing the #19 (dual triode) output tube on an antique radio console with a pair of high voltage power mosfets. I hate to spoil the radio's originality, but this tube's audio just stinks! Even my AA5s sound much better. Bobby Dipole

12th September 2011, 08:54 PM	#2
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	For SE, the energy stored in the inductance of the OPT primary will cause the voltage across the primary to be almost 2*B+ when the output stage is driven fully. ~Tom

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