rafafredd
Well-known member
I´m working on the Langevin AM864 varimu comp and I would like to use DC heaters as I´m doing a PCB for the project. So, I would like to know if my calculations for heater current are right.
It uses two 6SK7 (300mA Ih each=600mA), one 6SN7 (600mA Ih) and one 6SQ7 (300mA Ih) that gives a total of 1.2A heater current at 6.3 VAC. But as I´m using 12 VDC, I think I´ll need two times this current (am I right?), and this is a lot. 2.4A just for one channel? UGH!
I was thinking about using a big transistor for the heater supply, with a 12v/1w zener driving the base, but I´m open to suggestions. What would you do?
It uses two 6SK7 (300mA Ih each=600mA), one 6SN7 (600mA Ih) and one 6SQ7 (300mA Ih) that gives a total of 1.2A heater current at 6.3 VAC. But as I´m using 12 VDC, I think I´ll need two times this current (am I right?), and this is a lot. 2.4A just for one channel? UGH!
I was thinking about using a big transistor for the heater supply, with a 12v/1w zener driving the base, but I´m open to suggestions. What would you do?