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I keep going back to the growl and low mic occuring after replacing the finals. The growl is in rx and mic is low. I can't help but think the growl is oscillation in the PA section, possibly from biasing incorrectly. Also wondering what caused the old finals to death nap. Could also explain the low mic, as there isn't enough headroom to add audio, if the oscillations are consuming your output. Even the growl, if the pa is oscillating, could pop into the Rx, if oscillating at random frequencies. I don't think grounding the mic input would bother the mic amp too much, but you can check the 10k resistor R187 and see if it's correct ohms or darker in appearance, possibly burnt. I haven't seen an op amp go weak before. I'm just stuck on the final replacement, unless I'm ignoring something posted earlier, I do speed read these posts sometimes, often many times. I'm gonna read it all again, slower.

<blockquote data-quote="Cable Guy" data-source="post: 846844" data-attributes="member: 16662"><p>I keep going back to the growl and low mic occuring after replacing the finals. The growl is in rx and mic is low. I can&#039;t help but think the growl is oscillation in the PA section, possibly from biasing incorrectly. Also wondering what caused the old finals to death nap. Could also explain the low mic, as there isn&#039;t enough headroom to add audio, if the oscillations are consuming your output. Even the growl, if the pa is oscillating, could pop into the Rx, if oscillating at random frequencies. I don&#039;t think grounding the mic input would bother the mic amp too much, but you can check the 10k resistor R187 and see if it&#039;s correct ohms or darker in appearance, possibly burnt. I haven&#039;t seen an op amp go weak before. I&#039;m just stuck on the final replacement, unless I&#039;m ignoring something posted earlier, I do speed read these posts sometimes, often many times. I&#039;m gonna read it all again, slower.</p></blockquote><p></p>

[QUOTE="Cable Guy, post: 846844, member: 16662"] I keep going back to the growl and low mic occuring after replacing the finals. The growl is in rx and mic is low. I can't help but think the growl is oscillation in the PA section, possibly from biasing incorrectly. Also wondering what caused the old finals to death nap. Could also explain the low mic, as there isn't enough headroom to add audio, if the oscillations are consuming your output. Even the growl, if the pa is oscillating, could pop into the Rx, if oscillating at random frequencies. I don't think grounding the mic input would bother the mic amp too much, but you can check the 10k resistor R187 and see if it's correct ohms or darker in appearance, possibly burnt. I haven't seen an op amp go weak before. I'm just stuck on the final replacement, unless I'm ignoring something posted earlier, I do speed read these posts sometimes, often many times. I'm gonna read it all again, slower. [/QUOTE]

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