I recently picked up a Heathkit HD-11 "Q Multiplier" for free, and I can't figure out what it does. I did some research online and figured out that it was used somewhere in older transmitters that had low IF frequencies. Unfortunately, I don't understand how I can use it. Also, I was confused because it only contains one tube, a 12AX7. The strange thing about this tube is that it is not suitable for radio frequencies because of its high miller capacitance. Everything appears to be intact and when I plug it in, the tube lights up. My questions are "What does it do exactly?", "What can I use it for?", and "Should I keep it, or take the parts out and reuse them?". My camera is broken at this point, so I can't post any pictures. Please help.