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<blockquote data-quote="John Roberts" data-source="post: 106431" data-attributes="member: 126">Re: Amp kicks out on Mic ONLY with 8 ohm to 70 V Xfmr on Amp outputA subtle issue with that L-R connection, it will work the way you say, but the amp may not be designed to be operated like that.For a full strength L or R signal the opposite channel of the power amp will be providing the 0V synthetic ground. In effect that opposite synthetic ground is sinking the max signal current while holding the voltage at 0V. For a linear amplifier output stage this is the worst case for power dissipation. Max current times full PS voltage.In the old hifi trick, this difference L-R signal for stereo program does not contain much energy. But banging both sides with different full strength mono signals will make those opposite amp channels do some work.&nbsp;&nbsp; The may be TMI for the OP, just thought I &#039;d let you know why it blew up, if it does. Of course it may just get hot and keep on truckin.&nbsp; JR</blockquote>

[QUOTE="John Roberts, post: 106431, member: 126"] Re: Amp kicks out on Mic ONLY with 8 ohm to 70 V Xfmr on Amp output A subtle issue with that L-R connection, it will work the way you say, but the amp may not be designed to be operated like that. For a full strength L or R signal the opposite channel of the power amp will be providing the 0V synthetic ground. In effect that opposite synthetic ground is sinking the max signal current while holding the voltage at 0V. For a linear amplifier output stage this is the worst case for power dissipation. Max current times full PS voltage. In the old hifi trick, this difference L-R signal for stereo program does not contain much energy. But banging both sides with different full strength mono signals will make those opposite amp channels do some work. The may be TMI for the OP, just thought I 'd let you know why it blew up, if it does. Of course it may just get hot and keep on truckin. JR [/QUOTE]

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