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Old 10th Sep 2019, 9:13 am   #7
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 5,396
Default Re: Cathode follower line out - best practice

4mA sounds a lot of current.

What signal voltages are involved? And what cable impedances (I presume mainly capacitive)? Knowing these it is possible to calculate signal currents, and then decide on DC current. Following that, it's just a matter of biasing the valve.
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