01-08-2016, 06:02 PM
Hi Trevor, my experience with guitar amps has shown that DC supplies for heaters in output valves serves no purpose. In the preamp yes hum noise contributed in the high gain section can be considerable if not engineered right. Remember the output valves are trying create current gain to derive power in the O/P tx. Noise created from the heaters is so low as to be neglible, more hum in O/P stages occurs when the valves are out of balance.
I would convert the output valve heaters back to AC and save on hassle.
Dave.
I would convert the output valve heaters back to AC and save on hassle.
Dave.
