Quote:
Originally Posted by Electronic M
Isn't there 2 outputs on that knight (one audio one radio frequency)? There should be a fixed frequency audio output (something like 400Hz) that you can use to inject audio.
If there isn't an AF output on the Knight, do you have a junky (something won't be sad if you accidentally break it) radio or audio player (battery powered is preferable) with a working headphone or line output? You can make a cable that plugs into the output of your audio test source and has alligator clips on the other end. Put a roughly .1uF cap in series with the audio hot lead and feed that to the grid, clip audio ground to the chassis.
Alternately if you want even simpler just use a roughly .1uF capacitor to connect the heater hot lead to the grid...All you'll get is 60Hz hum, but it's a simple method to use when you don't have test equipment or sacrificial audio gear on hand.
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Hi Tom...you're right about the Knight. There's an RF out and an audio in/out as well. Anyway, I ran the heater voltage to the grid through the capacitor and nothing. The only noise this speaker has made is when I connected the audio output transformer leads to a 9v and the speaker crackles and pops as I touch the battery poles. So the fault, or the first fault, is somewhere between the first audio and the output leads of the AOT I would think.