10-06-2020, 11:11 AM
>Does 550 VCT mean 550 V across the coil if the center tap is unused.
It means that the total winding = 550v and it has a center tap. Or 225v from center to each end is another way to state it. Some p/s circuits depending the rectifier configuration require a ct and some don't, your does. The currents have to be added up. 5v@2A is fine, the 6.3v you'll have to lookup the heater currents of each 6v tube and total them. The 12AT7 can be wired for 6v @300ma. The HV current I did a rough calculation and came up with about 50ma so 57ma is good.
It means that the total winding = 550v and it has a center tap. Or 225v from center to each end is another way to state it. Some p/s circuits depending the rectifier configuration require a ct and some don't, your does. The currents have to be added up. 5v@2A is fine, the 6.3v you'll have to lookup the heater currents of each 6v tube and total them. The 12AT7 can be wired for 6v @300ma. The HV current I did a rough calculation and came up with about 50ma so 57ma is good.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
