06-03-2020, 10:00 AM
There is a small light bulb in the dial scale that is tied to a grid on one of the IF tubes. As the signal changes, this bulb glows brighter. The reason that I asked is because it is hard to find a suitable bulb. I used one of the very small "grain of wheat" bulbs. - - going from memory - - It is easy to miss this function altogether.