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I used to get audio on my Bell & Howell 1550. Lately, not. The BAK bulb is good. I tested it out of the projector, and it lights up at 5 volts DC when I put the negative lead to the bottom xxx and the positive lead to the 3-hole ring. I’m getting 5 volts DC to the projector socket. I stuck a piece of tinfoil in the socket in case the bulb wasn’t hitting the spring-loaded connection in the socket. That didn’t work. And then, when I put my hand in front of the projector lens, I get feedback. Any suggestions?