Howdy gents,
A client had an old Berlant Concertone tape machine amp that had already been partially gutted. I put it back together for him as a preamp, and he would like me to add phantom power to it. Wanted to run this by y'all.
It runs a 22V secondary to five tube heaters wired in series. A separate 6V secondary powers the 12BH7 meter buffer.
Which secondary do you think would be better to draw power for phantom? I'm inclined to use the 22V, since it would be a relatively simple task to double the voltage.
Is there any reason not to use the heater supply for phantom? Should I pull from the 500V B+ instead?
A client had an old Berlant Concertone tape machine amp that had already been partially gutted. I put it back together for him as a preamp, and he would like me to add phantom power to it. Wanted to run this by y'all.
It runs a 22V secondary to five tube heaters wired in series. A separate 6V secondary powers the 12BH7 meter buffer.
Which secondary do you think would be better to draw power for phantom? I'm inclined to use the 22V, since it would be a relatively simple task to double the voltage.
Is there any reason not to use the heater supply for phantom? Should I pull from the 500V B+ instead?