Search found 5 matches

by Musepro
Sun Sep 13, 2015 11:12 pm
Forum: JLM Audio Kits
Topic: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread
Replies: 8
Views: 11987

Re: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread

OK sorry forgetting the new kits have 2 x 200k lof pots so yes soldering front to back to make 100k is correct. Did you unsolder both makeup pot wires to see if both channels drop to the same level? Or if the mismatch is still there? If you have a scope you can check levels at the dingo unbalanced ...
by Musepro
Thu Sep 10, 2015 11:43 pm
Forum: JLM Audio Kits
Topic: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread
Replies: 8
Views: 11987

Re: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread

So if you swap ribbon cables over between MAC pcb does the level change stays with the MAC pcb or the dingo PCB? (you can unplug the link pcb and use the end idc cable plugs to reach across to opposite MAC pcbs) If the MAC pcb make sure you 100k log threshold pots fitted and have NOT joined the fro...
by Musepro
Thu Sep 10, 2015 6:46 am
Forum: JLM Audio Kits
Topic: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread
Replies: 8
Views: 11987

Re: MAC RACK KIT with RED MAC & DINGO PCBs Build Thread

Hello! Just built my latest pair of Mac-Racks. Both builds went perfect, as usual. However, on ONE of the Mac-Racks, channel 1 has about 2.8dB less output than channel 2 when the comp in ON (3:1, VU or GR, SCF Flat). This 2.8dB deviation occurs throughout the range of the make-up knobs, watching bot...
by Musepro
Tue Feb 24, 2015 9:41 am
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 151
Views: 107680

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

Meter.JPG After building 4 of these beauties, I had a few comments others might find useful. 1.) Installation of the new NSL32 optos are quite different than the previous VTL5C2. Seeing no notch or marking indicating opto polarity/position, and having already built a few LA500s and a Mac-Rack, I in...
by Musepro
Sun Feb 08, 2015 1:26 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 218569

Re: LA500 R15/R16 Smoking

Hey gang, After building a few LA500s, I had an issue with the last one. R15 and R16, the 10ohm resistors on the MAC PCB, would start smoking when powered up. After thoroughly checking the build of both the MAC and JLMIO PCBs, confirming proper component placements, polarities and solder joints and ...

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