06-12-2020, 05:18 PM
It's probably better not to float the heater. Can't quite justify that but it feels right. If you've got video on the cathode then don't connect directly to the heater. Try a 100K or so resistor. The capacitance from the heater supply to ground will not help HF response. Special transformers were used back in the day to deal with HK shorts.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
