Lab 12 Integre4 Owner's Manual - page 10
LAB12 integre4 Audiophile integrated amplifier
Tubes compatibility / Bias values
Bellow you will find a bias chart for the most common compatible tubes for integre4.
! After changing tubes always turn all the bias trimmers’
counterclockwise (cold bias) with bias screwdriver, before turning
on the amplifier. Wrong bias will destroy your tubes and possibly
your amplifier. Always adjust between following values for each type
of tubes immediately after turning on. Repeat bias procedure at least
3 times the first 5 hours of using.
Tube type
Lower bias limit
Higher bias limit
6L6
11mA
14mA
EL-34
13mA
18mA
6550
23mA
29mA
KT-88
27mA
28mA
KT-120
29mA
38mA
KT-150
36mA
42mA
If you are unsure about correct biasing please contact lab12 or advise an authorized dealer.