Kingston
Well-known member
I'm working on a tube circuit where I need cathode follower. Cathode-to-heater negative voltage difference can't exceed certain safe value, like 200V, same with positive difference. That would mean I should reference all the heaters of my amp to somewhere around 75V so that cathode and plate followers still work within their safety limits. I've done this several times with AC heaters, but this time I need DC and I'm not sure how to bias it.
How do I safely bias the DC heater supply? Can I just use around 75VDC drained from B+ acting as ground reference for the DC heater circuit? This reference drains very little current, right? And how to calculate that? Should I regulate this reference?
Thanks,
Mike
How do I safely bias the DC heater supply? Can I just use around 75VDC drained from B+ acting as ground reference for the DC heater circuit? This reference drains very little current, right? And how to calculate that? Should I regulate this reference?
Thanks,
Mike