Search found 2075 matches
- Tue Mar 19, 2024 5:37 pm
- Forum: JLM Audio Kits
- Topic: REPRO500 Kit BUILD THREAD
- Replies: 0
- Views: 735
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 ...
- Thu Mar 14, 2024 9:40 am
- Forum: JLM Audio Kits
- Topic: GEQ500 kit BUILD THREAD
- Replies: 13
- Views: 37404
Re: GEQ500 kit BUILD THREAD
Cool. Yes using a meter to double-check all resistor values is the best way to go when building.
- Wed Mar 13, 2024 6:59 pm
- Forum: JLM Audio Kits
- Topic: GEQ500 kit BUILD THREAD
- Replies: 13
- Views: 37404
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...
- Wed Mar 13, 2024 5:32 pm
- Forum: JLM Audio Kits
- Topic: GEQ500 kit BUILD THREAD
- Replies: 13
- Views: 37404
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...
- Tue Mar 12, 2024 11:04 am
- Forum: JLM Audio Kits
- Topic: BA500v2 Mic Pre Amp BUILD THREAD 500/51X
- Replies: 39
- Views: 81174
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...
- Tue Mar 12, 2024 10:54 am
- Forum: JLM Audio Kits
- Topic: BA BA2 BA4 BAD Dual99v Build Thread
- Replies: 376
- Views: 955240
- Mon Mar 11, 2024 9:41 am
- Forum: JLM Audio Kits
- Topic: BA500v2 Mic Pre Amp BUILD THREAD 500/51X
- Replies: 39
- Views: 81174
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...
- Thu Mar 07, 2024 7:04 pm
- Forum: JLM Audio Kits
- Topic: SIDEKICK Rack BUILD THREAD
- Replies: 0
- Views: 522
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 ----------------------------------------------------------------...
- Wed Mar 06, 2024 11:37 am
- Forum: JLM Audio Kits
- Topic: NV500 Mic pre BUILD THREAD
- Replies: 0
- Views: 517
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...
- Mon Mar 04, 2024 11:36 am
- Forum: JLM Audio Kits
- Topic: KRAFTWERK Power Supply BUILD THREAD
- Replies: 33
- Views: 115933
Re: KRAFTWERK Power Supply BUILD THREAD
Thanks, Joe, that's super. Can I just double check one more thing: from my 51X racks, I should wire the rack 'chassis' ground directly to the star point in the PSU case, is that correct, rather than the PCB audio 0v starpoint? Just wire your mains ground to the power supply chassis and onto the 51X...
- Sun Mar 03, 2024 12:35 pm
- Forum: JLM Audio Kits
- Topic: KRAFTWERK Power Supply BUILD THREAD
- Replies: 33
- Views: 115933
Re: KRAFTWERK Power Supply BUILD THREAD
hi Joe - a quick question about Kraftwerk grounding, I'm just trying to make sure I understand why there are two 0V points on those Phoenix output connectors. Audio ground is connected to chassis ground via 10ohm resistor in series with 0.1uF cap, right?, and I thought that's the only way that audi...
- Tue Feb 27, 2024 2:34 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 40021
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Ok 98.8k in parallel with 831k = 88.3k. So you can try a 1Meg pot. Since pots are +/20% it will not guarantee the pots will be at the same point in the turn of the pot due to the log curve mismatch but can help. Once you balance the ac volts at these 2 points you will need to redo the makeup balanc...
- Mon Feb 26, 2024 6:39 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
- Replies: 126
- Views: 331071
- Mon Feb 26, 2024 6:36 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 40021
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Ok here are the measurements CH A had .316 vac and 98.8k ohms with pcb cables unplugged. Ch B had .307 vac and 88.3k ohms with pcb cables unplugged. Settings are, y cable with 1.23vac at inputs. 1.3 ratio, VU, and flat. Ok 98.8k in parallel with 831k = 88.3k. So you can try a 1Meg pot. Since pots a...
- Mon Feb 26, 2024 12:10 pm
- Forum: JLM Audio Kits
- Topic: Scorpion Tube power Supply Build Thread
- Replies: 34
- Views: 45075
Re: Scorpion Tube power Supply Build Thread
There is no filament connected with those previous voltage measurements. The filament is set to 6V right now. These are the original tubes to the preamp. The 48V seems fine. Haven’t put a load on it though The schematic for the mic pre you put up showed 12v filament as the 2 tubes are wired in seri...