Groove Tubes VELO-8 Reference Manual
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Groove Tubes VELO-8, A little background on “Velocity” mics The VELO-8 name stands for “velocity” microphone, with a traditional “figure 8” polar pattern; hence, VELO-8. “Velocity microphone” is the original name used by RCA, Electro-Voice and others for what we commonly today call “ribbon” mics. They actually worked on reacting to sound wave velocity (or audio wind), so the name fits if you understand the technology. Most ribbon mics have a very thin aluminum element that looks like a silver ribbon. It is moved (activated) by very small amounts of sound (or air
Groove Tubes VELO-8, Another factor of the ribbon mics’fall from favor with modern studios was that they had very low signal output as compared to the electronically activated higher output condenser mics. They therefore required more preamplification to get similar output levels, which add noise floor to the signal from the increased amplification factor. For an example, listen to the hiss on Elvis’s “Love Me Tender” or Patty Cline’s “Crazy”, both recorded with early ribbon mics. In fact, ribbon mics can be up to 20dB weaker than condenser mics. This is really a problem today, as most mixers and preamps do not have the low input impedance to match t
Groove Tubes VELO-8, So why do ribbon mics sound so different? These obvious sonic differences result from variations in the few simple mic components; the ribbon, the magnetics, the transformer, and the interfacing design of these elements. The craft and design to combine these three components is most important, as with any transducer… little things can make BIG differences! Let’s look at each of these four areas in detail, and discuss how we created VELO-8 to be the best ribbon mic possible. 1. The Ribbon element: RCAmi
Groove Tubes VELO-8, stereo recordings!). Lastly, our VELO-8’s ribbon is field interchangeable by the user (more on that groundbreaking feature later). 2. The Magnetics: The classic RCA 44 ribbon mics were relatively high signal output devices (as compared with other ribbon mics) which was the result of a larger element and massive ceramic or Alnico alloy magnets placed around the ribbon element; more magnetic field gives more output, just like guitar pickups or speakers. These RCA 44 mics are favorites of engineers both today and
Groove Tubes VELO-8, to the signal. It can contribute much to the signal character, or it can degrade it as well. Cheaply made transformers degrade the signal a bunch, but good transformers are costly. This is the main reason studio product designers have moved away from using transformers in general and moved toward the MUCH cheaper “active” differential input stages made with FET or, worse, op amps for both output sections of microphones and input stages of preamps or mixers. However, in the golden years of recording, there were excellent quality transformers placed in both the output stages of all ribbon mics, as well as t
Groove Tubes VELO-8, perhaps the very best “wire winder” ever, his dad Ed Reichenbach. Ed owned and operated Reichenbach Transformer company during the golden age of Los Angeles studios. He made transformers for all applications, including for the studios. One of his outside sales guys was Dean Jensen. Dean specialized in studio customers and audio manufactures and helped design transformers to fit their demanding needs. Dean was a sales engineer, Ed was the designer and manufacturer. Later, Jensen formed his own sales company and named these “Jensen” transformers gaining (at th
Groove Tubes VELO-8, The dual contrasting sides, combined with our four selectable impedance and roll off options, give you eight different ways to use VELO-8! By the way, we think you will use all eight for various applications... and that was the idea, options are a good thing! 4a. VELO-8’s Field Replaceable Ribbon! This is perhaps the most revolutionary part of our design: our exclusive field interchangeable ribbon assembly. We anticipated that many of our customers will have never owned or operated a ribbon mic before (mostly because more folks can actually afford our VELO-8 as opposed to other ribbons). We also know that they will probably NOT read our severa
Replacing your VELO-8 PCB ribbon assembly 1. Getting Started Begin with a flat, clean, non-metallic work surface... a wood table is perfect. Make sure to remove all metal items that might be attracted to the VELO-8’s very powerful magnets. You will need a VELO-8 replacement ribbon (obviously), a small #1 Phillips screwdriver, a pair small scissors to open your a
Groove Tubes VELO-8, 2e. Disconnect the cable lead con- nector from the motor assembly to the PCB near the impedance switch, and carefully (there’s that word yet again) slide the connector harness through the round opening (should we be so common as to just say “small hole”) located between the upper and lower portions of the VELO-8 motor mounting plat- form. Move this assembly away from the motor. 2f. With one hand, hold the sides of the motor assem- bly and PCB keeping slight pressure on the PCB to ensure its alignment when the screws are removed. This sounds hard, but it’s not, and you will feel so accomplished when this is finally over. 2g. Remove the top screws first and move these away
Groove Tubes VELO-8, 3.0 Reassembly: Basically, these reassembly steps are in reverse order, so many of you will find these truths to be self evident, but in case you like the full hand-holding instruction session, here goes: 3a. Carefully (maybe I should try “cautiously” just one time, what do you think? ) place the bottom of the PCB at the base of the motor and hold with one hand, this means the PCB ribbon assembly will be at an angle so as to slide evenly into the gap between the magnets. Now slowly lower the PCB into the area between the two magnetic pole pieces, making
Groove Tubes VELO-8, 3d. Use caution (isn’t that better than carefully again?) as you guide the PCB connecting wire and plug back on through the access way (or “hole”) and replug (is that a word?) it back into the mating socket. 3e. Place the top portion of the chassis over them motor assembly, making sure not to make contact with the motor, and replace screws to secure the top of the head/shell to the mounting platform and mic chassis. 3f. Replace the bottom portion of the shell to the chassis, again, “carefully” noting the orientation of the graphics and impedance switch which is a tight fit so gent
Groove Tubes VELO-8, 13 VELO-8 REFERENCE MANUAL Groove Tubes Microphone Family Model: Diaphragm: Electronics: Patterns: Address: Applications: GT30 3/4”x 6 microns Class A FET Cardioid (omni & supercardioid optional) Top Excellent on stringed instruments, over- head cymbals and vocalists who already have a deep voice. Great for close-miking anything without proximity effect.Good results for most other applications. Model: Diaphragm: Electronics: Patterns: Address: Applications: GT40 3/4”x 6 microns Class A Tube Cardioid (omni & supercardioid optional) Top The ult
GROOVE TUBES 14 Groove Tubes Microphone Peripherals ViPRE: Groove Tubes’award-winning microphone preamplifier. Variable impedance input • Variable rise time • All tube, balanced Class A design • Precision gain control • Authentic VU metering SuPRE: Stereo tube mic and instrument preamplifier. • Two-channel stereo microphone and instrument preamplifier • Variable transformer imped
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