Output transformers resistance

nhuwar · 5th January 2007, 11:42 PM

Ok I'm sure this is a easy questions for most of you guys but how do I figuare the
primary resistance needed for a output transformer. Should it be the resistance of the plate load or not. Im looking at 2500 vdc at 317ma. Oh it's not a normal audio tube.

Any help would be greatly appreciated.

korneluk · 6th January 2007, 12:12 AM

I think what you are asking for is how to determine the "impedance" not the "resistance".

For a single ended triode (SET) application, the simple rule of thumb, as a starting point, is to use a primary impedance of 2x (two times) the Rp (tube's plate resistance) at the chosen operating point - you can get this data (either directly or derived from the curves) from the tube data sheet.

For a push-pull (PP) application the impedance should be 4x the plate resistance.

I hope this helps,

-- josé k.

nhuwar · 6th January 2007, 02:02 AM

Ya I knew about impedence or Z: but I was being generic anyway's thanks for the info.

Nick

nhuwar · 6th January 2007, 02:02 AM

Shut I know double posting is a no no but it's a tetrode not a triode.

Merlinb · 10th January 2007, 11:10 AM

Just decide what class you want it to run in and draw a load line:
http://www.freewebs.com/valvewizard1/se.html

5th January 2007, 11:42 PM	#1
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Output transformers resistance Ok I'm sure this is a easy questions for most of you guys but how do I figuare the primary resistance needed for a output transformer. Should it be the resistance of the plate load or not. Im looking at 2500 vdc at 317ma. Oh it's not a normal audio tube. Any help would be greatly appreciated.

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6th January 2007, 12:12 AM	#2
korneluk diyAudio Member Join Date: Jan 2005 Location: South Florida	I think what you are asking for is how to determine the "impedance" not the "resistance". For a single ended triode (SET) application, the simple rule of thumb, as a starting point, is to use a primary impedance of 2x (two times) the Rp (tube's plate resistance) at the chosen operating point - you can get this data (either directly or derived from the curves) from the tube data sheet. For a push-pull (PP) application the impedance should be 4x the plate resistance. I hope this helps, -- josé k.

6th January 2007, 02:02 AM	#3
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Ya I knew about impedence or Z: but I was being generic anyway's thanks for the info. Nick

10th January 2007, 11:10 AM	#5
Merlinb diyAudio Member Join Date: May 2006 Location: York	Just decide what class you want it to run in and draw a load line: http://www.freewebs.com/valvewizard1/se.html

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