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Title: audio distortion Post by: N0BST on June 03, 2007, 01:47:16 PM Got a Halliscratchers SX-122 that's developed some audio distortion. Replaced the audio coupling caps but it's still there. What else to check?
Scott Todd N0BST Title: Re: audio distortion Post by: Jim, W5JO on June 03, 2007, 02:08:03 PM Check the cap across the cathode of the audio output tube (s).
Title: Re: audio distortion Post by: WU2D on June 04, 2007, 10:02:08 AM Hi Scott, AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I'll throw in my 2c. Did you try replacing the 6GW8 audio tube? That is a tube trying to do a lot. Same with the AM detector/AGC tube 6BN8. Did you check to see if the distortion occurs on SSB/CW as well as AM? Confirm that both modes have audio distortion. Also check that the AGC is working. Does the distortion clean up at a low signal level? This test will point towards the audio tube or towards the AM/AGC tube or the product detector tube circuits. Mike |