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RE: what CCS for a 6sn7 driver tube

You will need to estimate the dissipation (in Watts) of the CCS. To do this you will need to decide what idle current (bias) you want for the 6SN7. E.g. 8mA. The current source "sets" the current and Kevin's are adjustable. Next you will need the grid bias voltage. If you are using a cathode resistor use Ohm's law to calculate (V= resistance x bias current). Now go to the plate curves for the 6SN7 and determine the plate voltage that corresponds to that grid voltage and bias current. This is an estimate as this will vary from tube to tube. Subtract the plate voltage from the B+ voltage of the PS that will connect to the + terminal of the CCS. This is the voltage across the CCS. Multiply this voltage by the current through the CCS in Amps and the result is the dissipation in Watts. Be conservative in choosing a heat sink for above the chassis and very conservative for under. If under, provide vent holes in the bottom of chassis under heat sink and vent holes in top for heat to escape.


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