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Under-Biasing Output Tubes [message #71705] Fri, 09 March 2012 08:04 Go to previous message
AudioFred is currently offline  AudioFred
Messages: 377
Registered: May 2009
Location: Houston
Illuminati (1st Degree)
The manual for my Ella amp recommends 0.40V for EL34 tubes and 0.45V for KT88's. I read somewhere that lowering the bias somewhat will extend tube life. The amp is rated at 50w/ch with KT88's, and I'm using efficient speakers that never require more than about five watts peak. What's the upside and downside of biasing the tubes to 0.43V instead of 0.45?
 
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