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Old 17th September 2004, 01:24 PM   #11
SY is offline SY  United States
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Originally posted by avxt
Thats means for optimum performance I still need a transformer that convert 6/7k to 4 ohms rite.

Do you know where can I download the original mullard 5-20 design article or information? (I have the 5-20 schematic)
No, that means that although you THINK you have 4 ohm speakers, you don't. You could call them "5 ohm" just as easily. You're not trying to drive a resistor (at least I hope not!), you're trying to drive a loudspeaker, a complex and tremendously variable load. Bottom line: don't sweat the difference between 4 and 5 ohm.

I'm sure a net search (or even a search of diyAudio.com) will yield a 5-20 schematic. If not, the Mullard tube book has been reprinted, available through AudioXpress. And I think it's also reprinted in Morgan Jone's "Valve Amplifiers", which is a book you ought to have anyway.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 20th September 2004, 12:53 PM   #12
nkg is offline nkg  Australia
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I don't know if you have but try e-mailing stephenspicer@telstra.com he may be able to supply the winding layout for you.He supplied the information for me to be able to get a pair of opt's wound for a Leak stereo 60. He may take a little time to get back to you but he has always been very helpful.
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Old 21st September 2004, 01:22 AM   #13
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Thx for your info.
I'll try to contact him.
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