It is an adaption of the original UREI 1176 LN to components and parts that are available (mostly) everywhere today. The rate at which the gain increases or decreases has a major influence on the overall quality of the compression effect. what voltage did you apply? The 6386 tube being the most popular part. Anyone? The principle on which they were working was that the level detector circuit sends the voltage to the tube. Fairchild and Altec compressors were the early devices built on this principle. 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? These are all optional settings in Logic’s own compressor plugin which is to be used for demonstration purposes. 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. If we are talking about hardware units, it is important to understand that tubes need some time to warm up. 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. 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. Reply. hey…i know it’s an old thread but could you tell my your experience more why is it awful? The circuit for this stereo compressor is amazingly simple for a compressor this well-sounding. And honestly, I think this thing probably won't sound too good. Today Manley makes the state of the art update on this approach. 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. http://www.ovnilab.com/articles/tubecomps.shtml, Your email address will not be published. Today’s post is from RADIO-ELECTRONIC ENGINEERING and was written by one Ed C. Miller. The G1176: The 1176 is a well-known and classic FET compressor. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. Therefore this can mess up your sound. c. So, what makes this different than a simple single stage tube amp? The principle on which they were working was that the level detector circuit sends the voltage to the tube. The reason for this is because the tubes are much more fragile when they are in the hot state. It has a somewhat different action, generally claimed to be even smoother and more “creamy” or “organic”. Despite the fact that this distortion only contributes 0.2% of to the amplified signal, the human ear ( subjectively ) finds it appealing. Vari-mu (short for Variable Mu, also a Manley trademark) designs use a vacuum tube in place of a transi… Your email address will not be published. Your email address will not be published. In addition, there is a reaction time of the tube as its gain changes by the level detector circuit. So, they’re often smooth out harsh sounding audio. But a suspicion isn't a valid reason to discount something that MIGHT be good. 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. I found this thread a few months ago, I find very easy to give a try, did you use 6SL7? Fairchild and Altec compressors were the early devices built on this principle. As the tubes warms up, they actually increase the temperature. The distortion is the result of the random movement of the electrons. A very simple audio compressor built with SSM2165 IC. On the most basic level, tubes amplify electricity. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. Opto (Optical) – named accordingly. This gives tube based compressors their unique attack and release time properties. The circuit that has out lasted other designs was … Tube Compressors . Your email address will not be published. Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. Today Manley makes the state of the art update on this approach. I would recommend putting at least one voltage-gain stage ahead of it, and an interstate volume control as well. 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? Before the introduction of transistors into the market in the 50s, vacuum tubes were used in electronic amplifiers. The sometimes musical and appealing distortion introduced by the tube based gain state is a part of the tube compressor sound. Tube-Tech CL 1B Optical Compressor. This voltage directly drives the gain of the tube. This voltage directly drives the gain of the tube. Required fields are marked *. Mine sounding pretty awesome…cheers! 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. This site uses Akismet to reduce spam. Fairchild and Altec compressors were the early devices built on this principle. Tube based ( or valve based ) compressors were, in early days of audio, the only choice of machine-modifying gain. Intend to something that MIGHT be good guitar amp the amplified signal inspiration Outside the Studio - to. Smooth out harsh sounding audio than a simple single stage tube amp generally claimed to be used demonstration! 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