Potato Cakes

Re: GSSL add-on help thread
« Reply #100 on: October 01, 2019, 02:20:54 PM »
Ok so l got to the bottom of my problem, and i had bugger all to do with the operation of the Turbo PCB....It was me...or to be more specific "The stupid balanced signal I have been feeding my GSSL from my mobile phone all this time" FACE PALM!!

Since my soldering/projects desk is some distance from my computer...and Cubase, I was playing audio from my mobile via a small Stereo jack going to two large jacks...just for convenience. so I decide to check my meter calibration whilst I was fault finding the turbo issue, so I hooked everything to Cubase, suddenly my feeble meter readings became hefty meter readings! another FACE PALM! hooked up the Turbo again and the needle is wiggling away nicely.

Now just to button up this sexy beast and put it to work.

I was going to remove this rather long winded post but it does end with a rather poignant "What not to do" so I will leave it for other GSSL builders.

And thanks again to Harpo for his help.

You had a question on GSSL page about the LCR compression characteristics of the the Turbo board, so not to pollute the stock build only thread with more mod questions, I'm replying here. If you viewed the video on Expat's website regarding this circuit, you get a full explanation of what it does and why. In the original SSL buss compressor circuit, the panning of the material source in the stereo field does not affect gain reduction. If I recall your post on the other thread, you mentioned you saw someone had posted a video of the turbo and the gain reduction changed with panning the material, and if that is the case this is not correct. If your GSSL with the turbo mod has the same gain reduction when applying tone and panning it between the left and right inputs, then you have a working mod. Anymore I when I build anymore of these compressors I permanently wire the Turbo circuit in as this gives the GSSL the compression characteristic why I would use an original buss compressor in the first place.

Thanks!

Paul


Re: GSSL add-on help thread
« Reply #101 on: October 01, 2019, 03:10:47 PM »
Hi Paul.

Yes that made more sense to me as the turbo was designed to give an equal side compression as to match the centre, it was a YouTuber known as "really nice audio" perhaps go take a look? My query related more to the fact that with the external sidechain engaged I got a imbalance when panning, I have since decided not to worry about it as the difference is small...it's just annoying.

Thanks for replying.

Potato Cakes

Re: GSSL add-on help thread
« Reply #102 on: October 01, 2019, 03:41:19 PM »
Historically, doing Turbo and SSC boards (which requires two of them as you know) has been a little tricky to get a perfect balance. If there is an unbalance with just the external in on the SSCs, then either the signal getting to both boards is not the same or the signal getting to the ICs on each board has some sort of variation if indeed there is balanced GR on all of other settings.

On a side note, I tend to agree with the Expat guys that an HPF for the sidechain in the GSSL is not necessary with the Turbo function. A parallel mix function gets much more use (at least for myself), which seems most any DAW incorporates in their external insert functions. Possibly I could see using an SSC for the Thrust characteristics, but I have a MixBuzz that I use for FOH mixing and I have yet to want to use that function, so I'm not sure if I'll ever actually want to have it for any future GSSL builds. An external input for the sidechain could be very helpful in the studio, but I would want to explore a simpler method to do this rather than the extra work (and expense) of wiring up two SSC boards.

Glad you've sorted everything out and enjoy your now working GSSL.

Thanks!

Paul

Re: GSSL add-on help thread
« Reply #103 on: October 01, 2019, 05:24:19 PM »
Historically, doing Turbo and SSC boards (which requires two of them as you know) has been a little tricky to get a perfect balance. If there is an unbalance with just the external in on the SSCs, then either the signal getting to both boards is not the same or the signal getting to the ICs on each board has some sort of variation if indeed there is balanced GR on all of other settings.

On a side note, I tend to agree with the Expat guys that an HPF for the sidechain in the GSSL is not necessary with the Turbo function. A parallel mix function gets much more use (at least for myself), which seems most any DAW incorporates in their external insert functions. Possibly I could see using an SSC for the Thrust characteristics, but I have a MixBuzz that I use for FOH mixing and I have yet to want to use that function, so I'm not sure if I'll ever actually want to have it for any future GSSL builds. An external input for the sidechain could be very helpful in the studio, but I would want to explore a simpler method to do this rather than the extra work (and expense) of wiring up two SSC boards.

Glad you've sorted everything out and enjoy your now working GSSL.

Thanks!

Paul

Yeah I did actually build the two SSC's in readiness but have decided its probably not worth the hassle, or potentially giving myself more problems to sort out.

I had even moded a new front plate to accommodate the SSC frequency rotary but that rotary is now going to become a glorified Turbo on/off switch....yes I know why not have the turbo fixed? well ive got to fill the hole with something :-)

Oh on the subject of external sidechain,  can you tell me how to wire a ts jack to this filter?, wouldn't mind having the option to feed a signal into it.

Cheers.