Follow up video. I have added this standby switching system to numerous old receivers. Stole the info from a National NC-300 diagram. It is safe, switches silent, very reliable method. The Hammarlund HQ-150 is known for whooping and popping when operating with a Ham transmitter. If you use headphones the result is very painful. This conversion is easy, no extra required parts, just rearrange wiring. You will be impressed with the resut. The new wiring diagram is posted, however if you would like a .jpg image, e-mail me and I will send it right out. Yes, D-lab is still in the ham equipment repair business, just doing my best to juggle all of the other repairs that are mounding at the door! More cool videos coming your way!

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