I will like a clean sound. One caveat: as the article warns, there are apparently ‘thumping’ artifacts inherent to this circuit, which was acceptable in its intended operation since it was designed for voice-frequency. Is it the configuration of the capacitors that cause the compression? Too good to be true. DOWNLOAD THE COMPLETE ARTICLE:Constant Output Broadcast Amplifier. http://www.ovnilab.com/articles/tubecomps.shtml, Your email address will not be published. Required fields are marked *. The principle on which they were working was that the level detector circuit sends the voltage to the tube. In order to be sure of the full potential of tube based gear one should power it on the beginning of the session and give it 10 to 15 minutes to warm up. Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. But this is one of those circuits that just won't leave me alone, churning in the back of my mind, a cheap, easy, MUSICAL tube compressor. In audio, vacuum tubes lend a characteristic sound when used as an audio amplifier. Beside compressors, tubes can be found a variety of devices, such as microphones, guitar amps, equalizers, etc. I am not sure exactly how it works but it sounds awful and i don’t recommend that anyone build it, total waste of time. Following is a brief explanation of three circuit types – Opto, VCA and FET. No tubes, but a nice solid-state do-it-yourself project. In the first place, one should understand why tubes exist in audio gear in the first place. Reader Bill W recently sent us a few interesting ancient DIY audio projects that we had not seen before. They need certain amount of time to warm up so that they can become stable. This effect is caused by small amount of the second-order harmonic distortion which occurs in the final gain circuitry of the compressor. It’s possible, but it would be ill advised. If we are talking about hardware units, it is important to understand that tubes need some time to warm up. Today Manley makes the state of the art update on this approach. 6 replies on “A Simple One-Tube Compressor Circuit c.1953” alex says: 01/22/2015 at 5:50 pm would this work at the front end of guitar amp? The audio signal is passed through the bulb, causing it to glow brighter or dimmer, representing the signal strength. The G1176: The 1176 is a well-known and classic FET compressor. This voltage directly drives the gain of the tube. The principle on which they were working was that the level detector circuit sends the voltage to the tube. Required fields are marked *. The principle on which they were working was that the level detector circuit sends the voltage to the tube. A very simple audio compressor built with SSM2165 IC. The reason for this is because the tubes are much more fragile when they are in the hot state. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. Hi. This voltage directly drives the gain of the tube. While the overall unit is probably not something you’d want to ‘F’ with, the limiter component could be added to a DIY tube mic preamp (perhaps with a true-bypass switch). Today Manley makes the state of the art update on this approach. These are all optional settings in Logic’s own compressor plugin which is to be used for demonstration purposes. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. The sometimes musical and appealing distortion introduced by the tube based gain state is a part of the tube compressor sound. It has a somewhat different action, generally claimed to be even smoother and more “creamy” or “organic”. Vari-mu (short for Variable Mu, also a Manley trademark) designs use a vacuum tube in place of a transistor, where the variable voltage input changes a tube’s bias instead of a transistor’s gain. c. So, what makes this different than a simple single stage tube amp? Therefore this can mess up your sound. Today’s post is from RADIO-ELECTRONIC ENGINEERING and was written by one Ed C. Miller. In the cases of valves, this occurs at exactly twice the frequency of the amplified signal. So, they’re often smooth out harsh sounding audio. what voltage did you apply? This circuit uses a light source and a photocell (phototransistor) or LDR (light dependent resistor). Tube-Tech CL 1B Optical Compressor. hey…i know it’s an old thread but could you tell my your experience more why is it awful? Fairchild and Altec compressors were the early devices built on this principle. Tube or valve compressors are mostly used after recording in order to add warmth to drums, vocals and basses. Before they completely warmed up, tube based audio processing devices can give you fluctuating outputs. Guitarists are mostly aware of this since these kind of amps are common. Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. It’s possible, but it would be ill advised. The circuit that has out lasted other designs was … This voltage directly drives the gain of the tube. information and ideas about audio history, on A Simple One-Tube Compressor Circuit c.1953, The JVC 900 Digital Audio Mastering System of the early 1980s, A DIY Broadcast Limiter Project circa 1955. Other known vari-mu-style examples are the Markbass Compressore and the Lightning Boy Opti-Mu Prime. On the whole, there are three types of compressor design – optical, FET and VCA – all mirrored in the circuit types offered by Logic’s Compressor plug-in. chris says: 01/27/2015 at 6:53 pm Hi. But a suspicion isn't a valid reason to discount something that MIGHT be good. The audio signal goes thru C1, R1, Audio Compressor Circuit with SSM2165 P. Marian - 09/19/2009. Despite the fact that this distortion only contributes 0.2% of to the amplified signal, the human ear ( subjectively ) finds it appealing. One of the first types of compressor offered was a so-called optical compressor, as made famous by compressors such as the Teletronix LA-2A. I found this thread a few months ago, I find very easy to give a try, did you use 6SL7? As the tubes warms up, they actually increase the temperature. Is strange 470K for plate, did you try lower resistance? This mini audio compressor circuit use only one active component T1. The distortion is the result of the random movement of the electrons. would this work at the front end of guitar amp? On the most basic level, tubes amplify electricity. The 6386 tube being the most popular part. Anyone? Your email address will not be published. On the other hand it is also desirable to let tubes cool down and then move it if you intend to. This gives tube based compressors their unique attack and release time properties. Opto (Optical) – named accordingly. The circuit for this stereo compressor is amazingly simple for a compressor this well-sounding. Reply. In addition, there is a reaction time of the tube as its gain changes by the level detector circuit. 6 replies on “A Simple One-Tube Compressor Circuit c.1953” alex says: 01/22/2015 at 5:50 pm would this work at the front end of guitar amp? The article details the operation and construction of the above-illustrated broadcast-remote mixer/amp, which includes a limiter. Vari-mu (short for Variable Mu, also a Manley trademark) designs use a vacuum tube in place of a transi… Because of this, tube compressors exhibit a distinct coloration or "vintage" sound that is nearly impossible to achieve with other compressor types. Anyhow, might be a fun project for a rainy day – build a pair of these into box with cheap 1:1 input transformers and simple line output stages? Fairchild and Altec compressors were the early devices built on this principle. Inspiration Outside the Studio - How to Stay Sharp and Creative. The AMR “System 1” 4-track cassette recorder of 1986, ADM Mixers and Consoles of the 1970s and 1980s, Effectron Digital Delays Original Catalog. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. Any increase or decrease of the gain is not instantaneous. Tube Probably the oldest type of compression is tube compression. This voltage directly drives the gain of the tube. The principle on which they were working was that the level detector circuit sends the voltage to the tube. Optical audio compressors use light as a signal for detection during the compression process. It’s possible, but it would be ill advised. Your email address will not be published. Other known vari-mu-style examples are the Markbass Compressore and the Lightning Boy Opti-Mu Prime. Tube Compressors . Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. We use cookies to provide you with the best experience possible. And honestly, I think this thing probably won't sound too good. Mine sounding pretty awesome…cheers! It is an adaption of the original UREI 1176 LN to components and parts that are available (mostly) everywhere today. This site uses Akismet to reduce spam. chris says: 01/27/2015 at 6:53 pm Hi. BASIC TUBE CAIN CONTROL In the better designs the tubes are Var-Mu or variable mu ( in the tubes books, also known as remote cut off). Reply. Vari-mu (short for Variable Mu, also a Manley trademark) designs use a vacuum tube in place of a transistor, where the variable voltage input changes a tube’s bias instead of a transistor’s gain. Your email address will not be published. 1. Learn how your comment data is processed. It has a somewhat different action, generally claimed to be even smoother and more “creamy” or “organic”. The sometimes musical and appealing distortion introduced by the tube based gain state is a part of the tube compressor sound. … Before the introduction of transistors into the market in the 50s, vacuum tubes were used in electronic amplifiers. Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. Crush some room mics? The rate at which the gain increases or decreases has a major influence on the overall quality of the compression effect. Let tubes cool down and then move it if you tube compressor circuit to ( )! Is not instantaneous based audio processing devices can give you fluctuating outputs tube audio... Guitarists are mostly used after recording in order to add warmth to drums, vocals and basses uses a source! 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