So, they’re often smooth out harsh sounding audio. The circuit for this stereo compressor is amazingly simple for a compressor this well-sounding. The principle on which they were working was that the level detector circuit sends the voltage to the tube. Tube-Tech CL 1B Optical Compressor. Despite the fact that this distortion only contributes 0.2% of to the amplified signal, the human ear ( subjectively ) finds it appealing. It’s possible, but it would be ill advised. Anyone? Reply. Crush some room mics? Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. Because of this, tube compressors exhibit a distinct coloration or "vintage" sound that is nearly impossible to achieve with other compressor types. 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? I will like a clean sound. 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). There is no much explication about this compressor circuit . 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. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. DOWNLOAD THE COMPLETE ARTICLE:Constant Output Broadcast Amplifier. 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. This voltage directly drives the gain of the tube. Today Manley makes the state of the art update on this approach. Before the introduction of transistors into the market in the 50s, vacuum tubes were used in electronic amplifiers. 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. Mine sounding pretty awesome…cheers! Your email address will not be published. chris says: 01/27/2015 at 6:53 pm Hi. would this work at the front end of guitar amp? Tube compressors tend to have a slower response — slower attack and release — than other forms of compression. It is an adaption of the original UREI 1176 LN to components and parts that are available (mostly) everywhere today. In the cases of valves, this occurs at exactly twice the frequency of the amplified signal. The audio signal goes thru C1, R1, Audio Compressor Circuit with SSM2165 P. Marian - 09/19/2009. This voltage directly drives the gain of the tube. In addition, there is a reaction time of the tube as its gain changes by the level detector circuit. 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? 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. what voltage did you apply? 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? 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? This gives tube based compressors their unique attack and release time properties. Optical audio compressors use light as a signal for detection during the compression process. This voltage directly drives the gain of the tube. Learn how your comment data is processed. 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. Fairchild and Altec compressors were the early devices built on this principle. 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). Required fields are marked *. The sometimes musical and appealing distortion introduced by the tube based gain state is a part of the tube compressor sound. The rate at which the gain increases or decreases has a major influence on the overall quality of the compression effect. This mini audio compressor circuit use only one active component T1. Other known vari-mu-style examples are the Markbass Compressore and the Lightning Boy Opti-Mu Prime. In the first place, one should understand why tubes exist in audio gear in the first place. These are all optional settings in Logic’s own compressor plugin which is to be used for demonstration purposes. The distortion is the result of the random movement of the electrons. chris says: 01/27/2015 at 6:53 pm Hi. This voltage directly drives the gain of the tube. I found this thread a few months ago, I find very easy to give a try, did you use 6SL7? They need certain amount of time to warm up so that they can become stable. Opto (Optical) – named accordingly. The principle on which they were working was that the level detector circuit sends the voltage to the tube. But a suspicion isn't a valid reason to discount something that MIGHT be good. The principle on which they were working was that the level detector circuit sends the voltage to the tube. Reader Bill W recently sent us a few interesting ancient DIY audio projects that we had not seen before. 1. It’s possible, but it would be ill advised. Is strange 470K for plate, did you try lower resistance? The AMR “System 1” 4-track cassette recorder of 1986, ADM Mixers and Consoles of the 1970s and 1980s, Effectron Digital Delays Original Catalog. 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. Any increase or decrease of the gain is not instantaneous. Before they completely warmed up, tube based audio processing devices can give you fluctuating outputs. Today Manley makes the state of the art update on this approach. As the tubes warms up, they actually increase the temperature. The article details the operation and construction of the above-illustrated broadcast-remote mixer/amp, which includes a limiter. Tube Probably the oldest type of compression is tube compression. It’s possible, but it would be ill advised. Vari-mu (short for Variable Mu, also a Manley trademark) designs use a vacuum tube in place of a transi… And honestly, I think this thing probably won't sound too good. This effect is caused by small amount of the second-order harmonic distortion which occurs in the final gain circuitry of the compressor. Fairchild and Altec compressors were the early devices built on this principle. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. … Your email address will not be published. Today’s post is from RADIO-ELECTRONIC ENGINEERING and was written by one Ed C. Miller. The audio signal is passed through the bulb, causing it to glow brighter or dimmer, representing the signal strength. Fairchild and Altec compressors were the early devices built on this principle. Tube Compressors . Today Manley makes the state of the art update on this approach. The 6386 tube being the most popular part. http://www.ovnilab.com/articles/tubecomps.shtml, Your email address will not be published. Following is a brief explanation of three circuit types – Opto, VCA and FET. The principle on which they were working was that the level detector circuit sends the voltage to the tube. 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. The circuit that has out lasted other designs was … 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. hey…i know it’s an old thread but could you tell my your experience more why is it awful? The sometimes musical and appealing distortion introduced by the tube based gain state is a part of the tube compressor sound. A very simple audio compressor built with SSM2165 IC. In audio, vacuum tubes lend a characteristic sound when used as an audio amplifier. Required fields are marked *. 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. This site uses Akismet to reduce spam. If we are talking about hardware units, it is important to understand that tubes need some time to warm up. On the most basic level, tubes amplify electricity. On the other hand it is also desirable to let tubes cool down and then move it if you intend to. Used after recording in order to add warmth to drums, vocals and.. During tube compressor circuit compression effect equalizers, etc the overall quality of the art update on this principle hot.! Everywhere today voltage directly drives the gain of the second-order harmonic distortion which occurs in the state. Simple single stage tube amp for plate, did you try lower resistance uses a source... 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