You press in stereo link on the back of your 500 rack for the two channels you are using for the comps (keep this on even when using not in stereo mode for any stereo compressor when you first install them). Then you switch both comps to stereo link mode on the front. Then you match the settings on both comps (or you can match the settings first and then turn on stereo linking). It's as easy as that.

can't you just send them in to the owner of Sound skulptor? he has a service of fixing units when you mess up. perhaps he can make them match?

@@chrisvanloo1007 Tube comps are never going to match perfectly. It's an inherent design quirk with electronics like tubes (as they have a +/- range (useually of about 10%) within which they will operate, rather than a fixed value that they will certainly be), it's not something broken that they could fix. The only way to get them to be closer is to buy stereo matched tubes, or get lucky with the tubes you get.

@@DaftyBoi412 i haven't built mine yet but at 5:20 you can clearly see him adjust the amount of compression or at least the amount shown on the meter.. maybe you can get them closer that way?

@@chrisvanloo1007 They are fully calibrated, it's just the tubes compression curve on mine is a bit out, it's expected with unmatched tubes. Mine match at the calibration point, but drift either side, and 3db differance max is nothing really compared to how bad it can get. Some tube driven opto comps go out by 5-10db when you really start digging in if the opto cells aren' t colsely matched... And that's just gain reduction, forget about the attack and release curves! ... Don't forget these types of compressors arn't precision tools, use aVCA comp or something for that, these are for gentle volume riding and colouring the sound. It's the same with pots, no two pots will be identicle, and most are only within 20% of each other! If you get lucky they will track ok, but get two pots at either end of their range and you'll have quite noticeable descrepencies between channels. Ofc you can adjust for it by turning the pot it's self, it just means you won't have matching settings on your left and right unit to get the same resistance values. (this isn't just this comp, it's all analouge gear!). It's why highly acurate stereo units are SOO expensive (like 3-5k minimum useually), as to get 5% or better you start to need stepped switches instead of pots, and then you're in the 1% range - but go look up the price of elmer or greyhill stepped switches xD, even 5% pots will cost and arm and a leg. 😉

@@DaftyBoi412 i wanted to link two of these comps and use them in my mastering chain as a stereo compressor limiter... now i'm not so sure anymore. sigh

Die EQs sind Teil des originalen Pultes. Die habe ich so gelassen und nur restauriert (also neue Caps, Schalter gereinigt…)

Ohh thank you! 🙏