Many of my regular readers will be familiar with the Shure Level-Loc. For those unfamiliar, the basics: the Level-Loc is a brickwall limiter made by the Shure microphone company for public-address-system use (podium mics, specifically) in the 1960s. It uses discrete transistors and transformers in the signal path; it offers balanced mic-level i/o and an unbalanced consumer-level 10K ohm impedance output as well. There is an input-level control (simply a pot that follows that secondary of the input transformer) and a switch marked ‘distance selector,’ which seems to me to be a threshold control. That’s it for control. It is fairly noisy (full-bandwidth noise), even after a recap, and the transformers are not especially well-shielded. It runs off of a 9V battery. For more information on the Level-Loc, you might want to start here.
I recently picked up a clean Shure Level-Loc for a few dollars at a yard sale; after the aforementioned re-cap (and we’re talking about 20 capacitors here…), it was sounding like it was probably operating within its original design parameters. I was intrigued, and figured it might be worth getting it into the racks at Gold Coast Recorders to see what it could do. GCR is a big, live-sounding room, so there’s plenty of sound to get out of it with a squashed compressor. The only potential problem: the Level-Loc offers only mic-level or low-level medium-impedance output. I like to run my mic preamps directly into the Lynx convertors; so for the most direct signal, I would need a bridging amp to bring up the level and lower the impedance of the Level-Loc. It would be nice to have an output level control too, and I wanted the piece to be as physically small as possible so that it could sit directly next to the Level-Loc on a 2RU rack shelf. Here’s what I did to solve all of these problems and fold the Level Loc into the studio alongside all the other outboard mic preamps.
Most of the RCA Receiving Tube manuals have a schematic for some sort of ‘audio input amplifier’; I wanted one that would provide about 20db of gain as well as a very low-impedance output so that I could drive a 15K:600 output transformer easily (I used an NOS UTC Ouncer to save space). Based on this i selected the circuit above RCA manual # RC-24. One 12AU7 tube. Simple, easy. The physically smallest plate/filament transformer that I had on hand was an NOS Stancor 120v:120V/6.3V, so I used the voltage-doubler B+ supply circuit as-found in the Altec 1566 and 438: here is that schematic via Tangible Technology:
First, the drumbeat: close-mics only: CloseOnly
Here’s the same mix, but with the Level Loc signal added: in this case, the Level Loc was amplifying a figure-8 ribbon mic 20 feet from the kit, with the null of the mic facing the kit; the waveform was then re-aligned to eliminate some of the delay: withLevelLoc
And finally, the Level-loc signal only: LevelLocOnly
The Level-Loc is aptly named. Regardless of what you put in – a baby’s breath or an atomic blast – you get the saaaaame level out. Zero dynamics. It’s pretty uncanny. And a great sound for heavy rock drum beats. This is the 2nd track that I have used it on in a week and I think it will continue to get a lot of use at the studio. The output of the balancing amp is a little low – even with the input attenuator all the way open it cannot quite get to full level via the Lynx convertors. It’s good enough, but it could stand to put out a few more DB. If you build one of these devices for use with your Level-loc you might consider using a 15K:60K interstage transformer at the input to get a little bit more level out of it; or re-bias the two stages in order to use a 12AT7 instead of the 12AU7.
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Man! Where's 'your' schematic?! :p
Seriously, though - I'd absolutely love to look at your modified circuit so I could do the same with mine. I'm pretty good with the basics and excellence with the building; But I'm just not quite there with all the design yet!
Absolutely love your site and feed. Keep up the interesting stuff my friend!
hi john. thanks for your interest. The schematics for the device are right there in the post, one is posted as a JPEG and for the PS just follow the link. Just add add a 15K:600 output transformer to the back end of the preamp circuit. Good luck, c.
Would you consider building one for sale? Thanks
sure. email me. see "contact us." c.
Thanks for the article, photos and sound examples. I used one picture for my blogpost:
http://melodiefabriek.com/blog/interview-mats-karlof-propellerhead-designing-pulveriser/
Hope you like that. Reason is using it's compression in the Pulveriser effect. I guess this is what I like so much about that Tchad Blake sound :)
I have moved on to the shure FP42. I much prefer it. it sounds just as extreme and crazy, but its stereo, pushes +28 output, balanced, has phantom power, and it's remarkable quiet. Oh and YES is still is transformer i/o! pretty amazing considering they go for about $100.
Great stuff, my man!! The link for the PS is no longer available. I'm really interested in giving this one a try. I love to smash sound, its a problem.
Fixed that link. Thanks. enjoy. c/
Any thoughts on the shure m367? It seems like the successor to the fp42, but six channel and individual channel limiting.
it's mono tho
not sure why...unless i'm using it wrong... mine squashes so much that there its small and thin sounding and don't get hardly any signal..it has been gone over by a pro tech ...and is working as spec... what am i doing wrong?
Funny question, I got a shure fp42 and when I opened it up it had the interior switch on the higher (220v or 240v mains). After switching it back to 110 I cannot get sound out of it. Cleaned the pots and switches with deoxit but nada. Was wondering if the XLRs could be wired like some 80‘s UK stuff, I‘ve had that problem before but wasn’t sure if it’s that common. I’m kinda new at this stuff - Any advice appreciated. Can’t seem to find anyone talking about that specific point on the Internets.