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Originally Posted by vineyardgray  While three conductors are typical in a balanced cable - you're right, they could have tied the shield to the chassis, I suppose (or left this end unsheilded?).
One final question then, the tie ins to the + and - 15VDC are to power those chips? (OK, two questions, should I worry that the rails are +14.99 and -14.93)? |
The shield is strictly speaking not a requirement for balanced audio. But I would assume the reason there isn't a screw terminal for it is because this was a retrofit and there wasn't another screw terminal available. Shouldn't prevent somebody from attaching the shield though - I would bet there's a screw someplace on the rear panel you can use.
Yes, the +/-15V rails are tied in to power this circuit. The smaller chip is an op amp that needs power. The voltages you measured are not a problem. Strictly speaking, they mean you get .04dB less headroom than you would with exactly 15V rails. In other words, there's absolutely no problem.