Re: +4/-10 button usage
I fried an RCA 77DX because it was wired with a grounded center tap for broadcast station use. Neumann's original phantom power instructions warned of this risk and of the need to rewire microphones but like most recording engineers in the '60s, only the shop guys had access to that documentation. Somewhere this myth that "it's perfectly safe" became popular among people who didn't realize their shop had checked and rewired their microphones.
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