JLM AUDIO

Thanks, Joe, I'll give that a go a see how I get on.

Roughly trying to sketch the relevant part of the circuit - it's the 2k7 resistor below, right, and physically the one on the board closest to my rough sketch of the circuit?

I’m going to build the fet di into its own dedicated 500 series module. Are there any changes i need to make to run it on the 16v standard rail? The FetDI circuit will work fine across the +/-16v but the pcb 0v will be at -16v so will have to have a look at how to isolate that and reference the 500...

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?:

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?

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 audio...

super, Joe, thank you! just to make sure I understand correctly, is the below roughly what you mean? And is there a way for me to understand how to calculate the value for R13/R14 correctly? If it's too complicated to explain, let's just say I'll stick with the NE5532A

If I'm building this, I'm thinking I might as well take the chance to customise it to my needs, and I'm wondering can I annoy you with a few more questions? I'd like to add a mute switch (with LED lit while muted), an extra Balanced TRS output, and an extra unbalanced TS out for using a tuner (only ...

o.k., super Joe, I really appreciate your wisdom on this, thank you!

oh super stuff, Joe, that is great. thank you! re the opamps, I was thinking of going the DIY route with either a pair of garOA10's or a pair of Pier Paolo's APP992's, if you think they'd work o.k.? I'm planning on ending up with a LOT of your JLM99v's in other equipment in the studio (I've already ...

I'm considering using a Mono as an on-stage preamp for gigs. I'm trying to figure whether the output would be protected against phantom power inadvertently being sent to it. Would 'accidental' phantom coming in through the output XLR potentially fry the opamps? If so, I'm guessing either blocking ca...

Super, Joe, thank you so much!

Am I right in guessing that you think the output attenuator is simply not a good idea, Joe? I found this old thread that quotes you as saying you "would never put an output control on a baby animal because it will take away from headroom and adds output damping" (https://gearspace.com/board/geekzone...

hi Joe, I had this email exchange with you back in 2022: [me]I'd love to replace the DI with an output volume knob - can you tell me about how to do this, and is there anything i need to do at the ordering stage via your website? [you] Basically you will need one of our dual 1k log pots + resistor t...