With the tube shields on, it's hard to tell when the Seduction is running. Would there be any issue with sticking a common orange or red LED in one of the holes meant for the Hammond box (not needed in my case) and then running the LED, in series with a 1000 ohm resistor, in parallel with the two 6.3V tube heaters? I'm assuming this would only add about 20mA of current to the winding, depending on the LED?