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Under-Biasing Output Tubes [message #71705]

Fri, 09 March 2012 08:04

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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[Message index]

		Under-Biasing Output Tubes By: AudioFred on Fri, 09 March 2012 08:04
		Re: Under-Biasing Output Tubes By: Wayne Parham on Fri, 09 March 2012 09:39
		Re: Under-Biasing Output Tubes By: SteveBrown on Fri, 09 March 2012 17:39
		Re: Under-Biasing Output Tubes By: Thermionic on Sun, 11 March 2012 01:31
		Re: Under-Biasing Output Tubes By: AudioFred on Mon, 12 March 2012 04:59
		Re: Under-Biasing Output Tubes By: gofar99 on Wed, 14 March 2012 13:40
		Re: Under-Biasing Output Tubes By: SASAudioLabs on Thu, 22 March 2012 14:30
		Ella with EL34's By: spkrman57 on Sun, 22 July 2012 12:48

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