Leak tl/25+ OPT selection

[SY]

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.

[nkg]

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.
nkg

[avxt]

Thx for your info.
I'll try to contact him.