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audiomm · 16th Jan 2008, 10:31 pm

The 7581A is a bolt in replacement for the KT66. Quad used to supply these (about 10 years ago) as replacements for the original KT66's. They have as near as dammit the same electrical specs - including heater current.

16th Jan 2008, 10:31 pm	#6
audiomm Pentode Join Date: Sep 2007 Location: Ranfurly, New Zealand Posts: 170	Re: Quad 2 Valve power amp questions The 7581A is a bolt in replacement for the KT66. Quad used to supply these (about 10 years ago) as replacements for the original KT66's. They have as near as dammit the same electrical specs - including heater current.