Search found 2066 matches

by Joe Malone
Thu Mar 28, 2024 10:23 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
Replies: 107
Views: 183377

Re: Meter calibration issue

Hi Joe, I finished the LA500a, my first JLM build, and I really like the component layout, structure, and quality of the kit. The modular approach is really nice. The meter calibration process is giving me a bit of trouble, so I think I have a problem somewhere that I hope you can help me diagnose....
by Joe Malone
Wed Mar 27, 2024 6:06 pm
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

Heya Joe, Not sure if my post got confused with another partially, but I've got it sorted out now :) I had a bad solder joint that 8) was causing some trouble on the Control card. Just want to say I'm STOKED on the way these are sounding. Thank you for responding promptly. I am grateful! Much appre...
by Joe Malone
Wed Mar 27, 2024 9:39 am
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

Hi again Joe, Now that I've got my pair of GEQs all set up, one of them is working great but the other is having some prominent static when I engage the faders toward +. Thanks Ok, I would have never removed the socket no matter how melted as long as the metal sockets were not touching. Your bottom...
by Joe Malone
Mon Mar 25, 2024 7:34 pm
Forum: JLM Audio Kits
Topic: JLM Transformer mods for GAP 73, CL 7602 Mk1 and Mk2
Replies: 7
Views: 29304

Re: JLM Transformer mods for GAP 73, CL 7602 Mk1 and Mk2

I have worked on this mod with the GAP Pre 73 MK3 only with the output JLM111DC transformer. At the input I have the carnhill vtb9045m. For a very long time I used 1.5v at the primaries, but after a while I found the sound was a bit muffled, comparing it to IC preamps. So I looked for alternative v...
by Joe Malone
Mon Mar 25, 2024 3:13 pm
Forum: JLM Audio Kits
Topic: FREQ500 KIT Build Thread
Replies: 17
Views: 39088

Re: FREQ500 KIT Build Thread

Followup: Thanks Joe for all your troubleshooting help and testing info. After I corrected polarity on the Opamps, LEDs and related fallout, everything finally tested good. Also very happy to learn about Plugin Doctor to look at the EQ curves of JLM hardware and other plugins. The EQ’s sound and lo...
by Joe Malone
Mon Mar 25, 2024 3:12 pm
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

Hey there, Completed my build on the GEQ500 and did my first test run with my R9 and R10 carbon resistors popping (10 R). Any recommendations on things I should check to diagnose? Turns on briefly and then they pop. Thanks Hi If they burnt while you were doing the jumper test on the Edge pcb by its...
by Joe Malone
Tue Mar 19, 2024 5:37 pm
Forum: JLM Audio Kits
Topic: REPRO500 Kit BUILD THREAD
Replies: 0
Views: 607

REPRO500 Kit BUILD THREAD

Notes and Errata 1. Kits all have extra caps to change neck to bridge HPF to wider as suggested by some of our early users. See below new cap values to fit. 2. We have had some Black front panels the jack hole is tight. It is ok to file or drill the hole to correct roundness and size. 3. Make sure ...
by Joe Malone
Thu Mar 14, 2024 9:40 am
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

chairbot wrote:
Thu Mar 14, 2024 4:32 am
Batch number is 230509.

I finally got them metered and they appear to be 15k, thanks for your quick response though.

Its really hard to tell the color by the photo, sorry. (and in person too ha!)
Cool. Yes using a meter to double-check all resistor values is the best way to go when building.
by Joe Malone
Wed Mar 13, 2024 6:59 pm
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

Here ya go! I did not put them in the board yet, however everything else is soldered in. ok strange that looks like a 10k as the colour code the way you are holding it is backwards. But due to the light hard to tell if second band is black or dark green. If dark green it will be 15k. Wider gap colo...
by Joe Malone
Wed Mar 13, 2024 5:32 pm
Forum: JLM Audio Kits
Topic: GEQ500 kit BUILD THREAD
Replies: 13
Views: 23601

Re: GEQ500 kit BUILD THREAD

Hey there I received this kit today and have been hard at work populating and soldering it together. No issue with the edge board, but I'm now on the Control Board and it appears I may have been supplied with the wrong set of resistors. I have (4) 120ohm resistors rather than the build map's (4) 15...
by Joe Malone
Tue Mar 12, 2024 11:04 am
Forum: JLM Audio Kits
Topic: BA500v2 Mic Pre Amp BUILD THREAD 500/51X
Replies: 39
Views: 56300

Re: BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Hi Joe, Thanks for the reply, then for what kind of opamps/transformer combinations then do I need the 390pf ? Greetings Jasper Kit 2520 opamps are usually very unstable especially if used with VTX / OEP highi ratio transformers and any opamp you see oscillation on the output of the opamp at any ga...
by Joe Malone
Tue Mar 12, 2024 10:54 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 376
Views: 868304

Re: BA BA2 BA4 BAD Dual99v Build Thread

caoimhin wrote:
Tue Mar 12, 2024 8:45 am
Building a pair of BAD with JLM14 and JLM2503, and I want to add a 'ratio switch' for the output transformer for 1:1, 1:2, 1:3.

Can I do an idiot check that it's o.k. to just use a 3 position rotary switch like this?:
RatioSwitch.jpg
Yes that is correct :-)
by Joe Malone
Mon Mar 11, 2024 9:41 am
Forum: JLM Audio Kits
Topic: BA500v2 Mic Pre Amp BUILD THREAD 500/51X
Replies: 39
Views: 56300

Re: BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Hi, I have a question, I am using JLM14 as input transformer, JLM99V or JLM Twenty 5 Twenty SMD as Opamp, would do some tests and decide to go with the better sounding opamp. My output transformer is the JLM2503. Now the question is in the PCB GB500v2, for Cload, should I use 390pF or not ?. Please...
by Joe Malone
Thu Mar 07, 2024 7:04 pm
Forum: JLM Audio Kits
Topic: SIDEKICK Rack BUILD THREAD
Replies: 0
Views: 418

SIDEKICK Rack BUILD THREAD

NOTES & ERRATA None Link to SIDEKICK PCB Front Build map https://jlmaudio.com/builds/maps/SideKickFrontMap.html Link to SIDEKICK PCB Rear Build map https://jlmaudio.com/builds/maps/SidekickBackMap.html Build order Sidekick pcb kit.jpg ----------------------------------------------------------------...
by Joe Malone
Wed Mar 06, 2024 11:37 am
Forum: JLM Audio Kits
Topic: NV500 Mic pre BUILD THREAD
Replies: 0
Views: 358

NV500 Mic pre BUILD THREAD

UNDER CONSTRUCTION NOTES & ERRATA R30 is marked on pcb as 100k but is 10k for current orange HPF led to be correct brightness. The 2 x BA283AV SMD plug-in modules have been pre-biased so are plug-and-play and swapable. You can check if bias is correct by measuring the voltage across the 12R 1W resi...