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Old 27th November 2012, 03:31 PM
John Caswell John Caswell is offline
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Join Date: Dec 2005
Location: Wokingham, Berkshire
Posts: 1,700
Default Re: LF Lift in the KT88

Whilst on this subject I note that in Noel's review of the Icon Audio MB845 MkIIM that there is a lift in the freq. response of about 2.5dB at 5Hz so perhaps it is not uncommon.
I am going to guess that it is optx related as the two amps I tested had different optxs. Nigel's was fitted with Morite optx and peaked at about 4-5 Hz whereas the demo unit was fitted with our new (very very good) transformer manufacturer and peaked at about 6-7Hz. In both cases the lift was substantially reduced with the capacitor change as documented above.
I remain convinced that there is nothing to worry about.

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