I finished a Dave Royer Mod MXL tube mic and am very happy with the results. I carefully laid out the power supply to leave room for another power supply circuit board and pair of jacks in case I wanted to make another one.
Well, I'm so happy with it that I want to do just that. My concern is the power transformer being able to handle it.
In the schematic presented in this article,
Royer specifies a transformer with a 24VAC secondary and a 1A rating.
The transformer I used is a very beefy-looking Stancor 24V transformer but it's rated only 40VA, or 1.67A at 24V. To power two microphones, this would be about 1/3 amp less than specified.
I also have a lamp hooked up on the secondary side of the PT. Would probably have to move that to the primary side and use a 120V lamp. Or maybe not. How much does a little 24V bayonet-base lamp draw?
Does anyone here know more about the precise current draw demands of the Royer mod? Is the 1A transformer on the schematic over spec'd as some designers do? Does one of these mics really draw 1A of current?
Thanks in advance for any info you can provide.