Search found 7 matches

by Jerome
Wed Mar 19, 2014 2:56 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

"Unlinked, at -5db of gr, i have the same level on output on the 2 comps, and when Linked the good one jump to -3 dB of gr and the faulty one -4db of gr and with 1 dB of difference on the output. " This last example was at 10:1 both sc. flat and the difference of 1db on the output was between each o...
by Jerome
Wed Mar 19, 2014 2:34 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

I've just align the 2 comps with the good la 500, and again everything's fine with just this changement, the faulty ones now see 3:1 and 5:1 ratios. La 500 good back to good unit, and faulty la back to faulty unit. I've linked the comps, at 3-1 ratio sc. flat and the good one returned immediatly to ...
by Jerome
Wed Mar 19, 2014 1:15 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

I have +14.95 between pin 2 and pin 4 and -14.95 between pin 2 and 8 of the idc on the mac pcb

Thank you Joe
by Jerome
Wed Mar 19, 2014 10:30 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

[Joe] You are sure the relay is clicking in and you are not in permanent bypass? The makeup turns up the output level in GR or VU? Yes sure. 10-1 ratio works well and yes the makeup turns up the output level in gr and vu [Joe] Very strange as the ratios are only set on the MAC PCB. Have you tried sw...
by Jerome
Tue Mar 11, 2014 10:10 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

And with the non working one, when the unit is set to sc flat, gr, 3:1, and cranking up the threshold, there's no audible compression, and the meter doesn't move but there's a big increase in harmonics.

Thank you. Jérôme.
by Jerome
Tue Mar 11, 2014 10:05 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Hi Joe thanks for your response. For the la 500 that is working i have a slight increase in power when engaged, and perfectly the same between gr and vu. For -9dbfs i have -12,46 dbfs on bypass and -12,02 dbfs on vu and gr. Since i have this same lost of 3db in my chain with a purple audio comp, i t...
by Jerome
Mon Mar 10, 2014 1:22 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 628044

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Hi all, I've finished my 2 la500, was a very easy and excitement project! I'm a newbie in DIY, and speak french... (So if i could do it...) :D I've just finished the calibrating process and one is just perfect, everything's ok, sounds very good, but the second one doesn't respond to the 3:1 ratio at...