An AMI designed transformer using the Hiller style T14 bobbin, winding style and lamination with a 4:1 winding ratio suitable as a drop in replacement for HST-11a microphones and similar builds.
Built on the same platform as our Hiller style T14, the T13 can be used in both tube and FET mic circuits where a 10:1 ratio is desired. Specifically designed as a replacement for historic U87 mics, the T13 can be used as a mic upgrade or DIY kits.
Direct replacement for the T14 used in the historic AKG C12 and Telefunken Ela M 250/251 mics. Wound to be the Braunchbuch specs and using modern lamination made from the same nickel alloy mixture as used in the historic Hiller style T14 transformer
AMI designed transformer with simplified winding scheme of the historic BV8 transformer. Can be used as a cost effective alternate for applications needing a BV8 or a 6.5:1 winding ratio. The T47 is a PCB mounted transformer with pins.
AMI designed transformer with simplified winding scheme of the BV11 transformer. Can be used as a cost effective alternate for applications needing a BV11 and for some FET microphones. The T49 is a PCB mounted transformer with pins.
AMI designed transformer with simplified winding scheme of the historic BV12 transformer. Can be used as a cost effective alternate for applications needing a BV12. The T67 is a PCB mounted transformer with pins.
The circuit for the U67 is very unique compared to other microphones. The historic BV12 transformer is built very differently than your standard microphone output transformer. Designed with a Primary, Secondary and Feedback winding, the Feedback is a voltage sensing or feedback circuit that if engaged as an output by itself will cause the transformer to behave in a non-linear fashion. It is advised that one familiarize themselves with the technical aspects of a U67 before emarking on a DIY project.
The T67 provides the same flexibility as the BV12, the advantage being on a PCB board is that it is easier to make the necessary connections to utilize the T67. All of the windings are attached to pins and are essentially open loops. You must connect two Primary pins (and two Secondary and two Feedback) in order to create a loop with two terminals (see picture to left). Tying the Primary and Secondary together creates a 7:1 output ratio while tying the Primary to the Feedback creates a 22:1 output ratio.
High Quality Passive Direct Boxes are a necessity for recording and live sound environments. Typically they are utilized for running Instrument signal's over long balanced lines. A good one will sound good on anything and remain faithful to the instrument passing through it! The T71 passive direct Box is a very good example! It has a full and uniquely creamy tone, without any of the harshness and "sizzle" that plague other designs. Following suit with it's custom designed AMI transformer, the T71 has some features that set it apart from the others. The input Impedance selector, and Top-Boost allow the engineer some different options for different pickups and setups. In addition, it's Dual Output Splitting capabilities make it a more flexible option for routing the signal. For example, a bass player can run a self contained personal monitoring rig as well as feed directly to the FOH Mixing Console. We recommend trying the T71 against the other passive transformer-balanced Direct Boxes on the market. You will be surprised by the difference in tone and frequency response it offers!
Designed using the Hiller style T14 bobbin and lamination with a similar winding style and ratio of the historic BV8 transformer. Designed to work with U47 style amplifier circuits in microphones with narrow bodies.
AMI designed replacement transformer for ribbon mics. The TR42 works at an output impendance that correspondes to the standards of modern mic pres while providing greater clarity.
AMI designed transformer used as a modification replacement for CMV563, UM57, UM92 and UM92.1. It is a direct replacement for the UM75. Can be used with an EC92 or EF86 tube circuit.
After years of inquiries from customers asking if we could offer the V72S as a DI box, we decided to introduce this historic Telefunken design reshaped for direct signal processing. Inspired by the historic V71 made by Malotki, and based on the schematic of the historic V72s by Siemens, this direct preamplifier takes care of all your high impedance signal needs. This unit comes with minimal distractions and the same classic sound as the our TAB Funkenwerk V72S. The maximum input signal capability is +10dB before going into smooth tube break up. With a maximum gain of 36dB, the V71DI is an optimal solution for buffering or amplifying any unbalanced signal source; from guitar and bass pick ups to CD players, radios, sound cards, keyboards, etc. The V71DI circuit layout is extremely quiet and gives this all tube design a better signal to noise ratio (-100dB @ 0dB/-90dB at max. gain) than standard Digital Sound cards, and most discrete or op amp based DI boxes.
Product Features:
Schematic based on historic V72s
Transformers constructed faithfully to the historic V72s specs
NOS tubes (Telefunken, Valvo, Philips)
36 dB of gain
Single gain switch
Direct Input
Phase Reverse
100 Ohm Resistive Ground Buffer
5-year Warranty
The V72M is our latest addition to our V series line of products. The unit features the exact same circuit path and components as our world famous V72S in a one rack space unit. This will allow us to manufacture the units more quickly as well as bring the overall price of the unit down (one pre-amp versus two). Based on the historic V72s made by Siemens for Telefunken, the V72M uses one gain knob built in the European style of gain management. The first 40 dB of gain is derived from a mixture of changing the input sensitivity of the input transformer combined with make-up gain from the feedback control of the circuit. The reamining 20 dB of gain comes directly from the feedback control of the circuit. This allows the unit to sound virtually the same throughout the entire gain range from -6 dB all the way up to +60 dB. Coupled with a 5-year warranty, this unit is ready to provide vintage sound without the fear of electronic failure that comes with vintage equipment. Product Features:Schematic based on historic V72sTransformers constructed faithfully to the historic V72s specsNOS tubes (Telefunken, Valvo, Philips)60 dB of gainSingle gain switch combining Input Sensitivity with Make-up GainDirect InputRamped Phantom Power supply with a true +48VPhase Reverse120 Hz Shelf EQ100 Ohm Resistive Ground Buffer Bilder weichen ab und zeigen die Stereoversion. The stereo version is shown on pictures.
It's been over a decade since we first made our first V series product under the TAB Funkenwerk brand name. What started off as an experimental project for fun, grew into a full fledged business. After repairing, modifying and even resurrecting hundreds of historic V series units, Oliver decided to see what would happen if he built one from scratch. Armed with the schematics of the historic V72s made by Siemens, transformer winders purchased from Boeing Surplus, and a box of NOS Telefunken tubes, Oliver started down the path. During the development stage, Oliver sent the unit back to Hannover, Germany twice to be auditioned by former TFK engineers to make sure that he had successfully captured the sound of the historic V72s. At the same time, Oliver was able to add some modern touches to the unit without compromising the sound. Silver plated Teflon and magnetic wire were new inventions since the historic pieces were originally built and greatly helps keep the phantom power supply from burning up the input transformer which was common back in the day. Additionally, he added in some of the modern controls that today's studios are looking for; direct input, phase reverse, 120 Hz shelf, 100 Ohm ground resistive buffer, etc. Once he was satisfied with the results, he set about producing more of these units. The first thing that he discovered was that many of the components were difficult to come by. Many of the companies that had supplied the sub-components for the historic versions were no longer in business. That meant that new tooling would have to be built. Fortunately, we were able to obtain some of the original machinery from former employees who had acquired the equipment as the various factories were being closed. We were also able to get detailed descriptions of the various tools that would need to be made from the former employees still living in Hannover, Germany. To get the transformers accurate to the originals, Oliver called up several of the original engineers to understand not only how they manufactured the specific transformers needed for this unit, but how they went about designing and building new transformers for new applications. As a result, AMI supplies transformers to several engineers who repair and recondition historic V series units because they are so carefully matched to the original design and production.Once he had all of these pieces in place, Oliver was able to start making the units in Gaylord, KS; winding his own transformers, building custom lamination, searching the world for lost supplies of NOS tubes, hand acid etching his own circuit boards, etc. The units are so highly regarded and so hard to come by that they rarely ever come up for sale. Currently, this unit is only built through custom ordering directly from AMI. Product Features:Schematic based on historic V72sStereo in one rack spaceTransformers constructed faithfully to the historic V72s specsNOS tubes (Telefunken, Valvo, Philips)60 dB of gainSingle gain switch combining Input Sensitivity with Make-up GainDirect InputRamped Phantom Power supply with a true +48VPhase Reverse120 Hz Shelf EQ100 Ohm Resistive Ground Buffer
Ribbon mics, more so than condenser or dynamic mics, need to be properly impedance matched to the mic pre-amplifier. Ribbon mics use transformers and every ribbon mic's output impedance is different, ranging anywhere from 50 to over 600 Ohms. The problem is that most mic pre-amplifiers come with a transformer set to one specific input impedance. If the input impedance of the mic pre is dramatically less than the output impedance of the ribbon mic, this can result in what is referred to as "undershoot" and the mic will sound dull. That is because the mic pre is unable to properly manage the high end frequencies picked up by the mic and the result is a 3-6 dB attenuation of signal in the frequencies over 10 kHz. If the input impedance of the mic pre is dramatically more than the output impedance of the ribbon mic, this can result in "overshoot" and the mic will sound harsh or brittle as the high end frequencies are over-exaggerated. We designed the V77M to solve this issue. Using the same switching system as our V78M, the Input Sensitivity switch taps directly into the Input Transformer and changes the Input Impedance of the transformer. While the Input Sensitivity switch has six positions to choose from, the V77M comes equipped with an Input Sensitivity range selector switch that allows you to switch between two ranges of impedance; 12 to 200 Ohms and 200 to 1000 Ohms effectively providing 12 different impedance selections. Product Features:Schematic based on historic V72sTransformers constructed faithfully to the historic V76 specsNOS tubes (Telefunken, Valvo, Philips)76 dB of gainSplit Input Sensitivity with Make-up Gain switchesInput Sensitivity Range selector, allows 12 positionsPhase Reverse120 Hz Shelf EQ100 Ohm Resistive Ground Buffer
€1,999.00*
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