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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Good question on "Ultra-Linear". posted by cheap-Jack on March 20, 2007 at 13:39:39:
Hi ,
Mullard used 20% taps for higher output power or 43% for minimum distortion . Leak designs used 43% screen taps , they also used series resistors between the screen and screen taps in an attempt to reduce distortion . Williamson never advocated ultra linear in the original 1947 article or the later 1949 addendum published in Wireless World . Later designs which were based on the Williamson input stage and driver did . Quad 2 topology is somewhat different to UL , the load is split 90% to the anode and 10% to the cathode , no screen taps at all , this supposedly provides a low output impedence with pentodes with far greater power efficiency than triodescheers
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- Misinformation - fatbottle 03:46:15 03/22/07 (0)
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