wwittman wrote on Mon, 30 March 2009 22:12 |
The original Fairchild 670 isn't "stereo linked" when it's in Left/Right mode????
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Looking at the schematic, I'd say not.
It isn't linked in EITHER mode, although when you're in vertical/lateral (which is essentially M/S ) the whole point is that you DON'T want vertical and lateral linked. -You don't want stereo width to be unnecessarily narrowed when the signal gets loud, nor do you want the level to drop if the stereo image gets wide.
The Left-Right/Lat-Vert switch on the Fairchild switches between two distinct modes, in both of them the gain reduction voltage is unlinked. In left-right mode, the two limiters work as two fully-independent mono limiters, each acting on the signal appearing at each discrete input. In lateral-vertical mode, the two limiters work as two fully-independent mono limiters, one acting on the SUM of the two signals, the other acting on the DIFFERENCE between the two discrete inputs. -At no time are the two sidechain rectifier outputs in any way connected.
The easy test to prove the case is to select left-right mode, and put a constant-level tone through one channel, then a loud pulsing signal (eg: kick drum) through the other. Squash the pulsing signal significantly, and then meter the tone. If it doesn't "dip" in reaction to the peaks on the other channel, then the unit performs exactly as the schematic suggests it should. -I recommend performing the test because I've seen more than my fair share of incorrectly-drawn schematics in my time...
Keith