Deja The unit uses 1% precision metal film resistors on a "make before break" multi-position switch. Could someone run the circuit through one of those simulator programs and see the response characteristics? However, as a master volume control on a larger amp I think the feel of the control would be entirely acceptable. See the parts list for further details. Guitar Amp Schematics Two wires were soldered to the resistor, with one connected to the L-Pad and the other to the impedance switch. Tube Amp Attenuator Amp Attenuator DI Attenuator Tube Amp https://www.thegearpage.net/board/index.php?threads/1072793, https://www.thegearpage.net/board/index.php?threads/974159, Kirk Hammett: Maybe the age of active pickups is over, Unacceptable or overly critical? Attenuator My goal was to find a replacement for volume potentiometers without breaking my budget for an entire amp. It allows you to crank your tube/valve amp up some more without the accompanying volume. If you need a guitar amp schematic for your amp repair that is not listed here, contact us and we'll try to locate it. Reactive Go over to the Amp Garage site, check out the Trainwreck files, where they have all kinds of info on the Airbrake. You wouldnt connect a 30-watt speaker to a 100-watt amplifier, and attenuators are no different. DIY Reactive Variable Attenuator (Demo and Schematic Look up the Airbrake type attenuator that the Trainwreck guys use. I downloaded an open source font from. + Natural Tone Technology, clear high end responce. Below are the schematics for the attenuator with and without the 4/8 ohm selector switch. Put a pot (in series with a low-value non-polarized cap 2 cm across) in + 2-step BITE and PUNCH Boost-Switch. wait just a secondbringing up NiChrome toaster wire sucking those precious dynamic wattages away was all Jeembob's idea and and and . no it was all SG's fault! Instead of moving a wiper across a restive element, these devices actually switch in different resistors at each of a large number of shaft settings to simulate the resistance one would get from a potentiometer of a given taper function. As you turn up the attenuator you are connecting more of the amp to the speaker, so no speaker means you are running the amp with no load. Weve rounded up 10 attenuation options, from $50 to $550, thatll let you hit your amp as hard as you like, while still maintaining your friendships. So I spent some time investigating various designs and features, sourcing parts and experimenting with components. Attenuator Schematic So I've been wanting to try out one of these ladder type stepped attenuators for a while now. All in all this is a great little project to build and comes in handy for taming all sorts of tube amps. Build a Guitar Amp Attenuator http://www.guitarpug.com/2008/07/diy-wattage-attenuator-box/. Although relatively few holes are required for the components, I drilled ventilation holes in the sides of the enclosure around the position of the L-Pad. you to collaborate with other designers. Courtesy to family and neighbours restricts the amount of time I can spend playing them at or near full volume. All thats needed is an 8-ohm resistor in parallel with the L-Pad. The easy solution is to use a rotary L-Pad controller. You wouldnt connect a 30-watt speaker to a 100-watt amplifier, and attenuators are no different. How are Plate treble and bass boost switches would be an excellent feature on any dummy Having said that, Id still be cautious about using it with amps more powerful than 50 watts. low noise metal film resistors making them significantly quieter than traditional hot formed carbon or even conductive plastic potentiometers. Created 21 June 2012. I should post a project like you describe. With both inputs playing there was no popping or noise when switching from one input to the other. So I thought I'd finally give one a try. by Herec Wed Nov 02, 2011 11:29 pm, Post The schematic uses a model of a speaker response, which seems reasonable and I have used it three times. All are available for free download. Below are the schematics for the attenuator with and without the 4/8 ohm selector switch. However,it seems, that a large reduction in volume , has a negative influence on the tone , particularly at high frequencies . JavaScript is disabled. My design uses a 100 watt L-Pad to attenuator the power of the amp. Attenuator Schematic Licho's site was http://www.szmo.com.pl/licho/www/taby/index_gb.html. For very high-mu triodes (like the 12AX7 or the 6SL7) this might be a problem, but most line driver stages will have significantly lower output impedance than this limit. Sure, you could simply roll down your amps volume when you receive the evil eye (or worse) from your bandmates, engineer, spouse, or neighbor, but then your tonal sweet spot disappears. resistor to safely load the amp like a so-called "8 ohm" speaker as This is a simple passive tube amp attenuator pedal build and it doesnt cost much. Speaker Load Emulator, Reactive + 2-step BITE and PUNCH Boost-Switch. Seems like the L-pad I built will work for you. Wiring the attenuator unit per the manufactures instructions was not an issue. Now at this point the attenuator is done, but it would be a bad idea to seal everything up inside this enclosure. The design is based on @robrob attenuators (on his website, thanks Rob) but with added attenuation states to successfully attenuate a 50 watter With an 8ohm speaker connected, this measures 8.1-8.2 ohm with the Here are the plans for making a power attenuator that allows you to turn down your speaker by up to -12db without One could adjust other freqs to taste for body. suddenly, I have completely switched from the hypothesis that the speaker If the sources are solid state virtually all devices will have an output impedance significantly lower than 12.5k. Also, resistive type attenuators tend to get real hot, so maybe some type of heatsink fins or ventilation scheme is in order. two single ended EL34, and one 2xEL84, http://www.ohmite.com/catalog/pdf/resistor_hardware.pdf, http://www.mouser.com/ProductDetail/Ohm 252b6aQ%3d. Sure, you could simply roll down your amps volume when you receive the evil eye (or worse) from your bandmates, engineer, spouse, or neighbor, but then your tonal sweet spot disappears. WebHome DIY Attenuator EMG Afterburner Power Attenuator No guitarist should be without one. A quick noise figure check showed that the bare unit has a noise figure ~26dB lower than a PEC hot molded carbon potentiometer of the same value. WebProduct information "TAD Silencer Power Attenuator". Very interesting, thanks for sharing this, much appreciated. I would like to build an attenuator to put between the out of my amp and the cone , which is a Celestion Vintage 30 . Amp Attenuators Like with most do-it-yourself effects projects for guitar, you should spend the Hot Plate. As it turns out, the output impedance of the control will peak at the following value: Using the rule that the load should be at least four times the output impedance, this means that the amplifier to which the control is connected should have an input impedance of over 100k. Just a little goes a long way and it's very easy to use too much and ruin an otherwise great meal/amp tone! Here it is, I'm going to build this over the next week. Attenuator Know that most "100W" tube amps will put amp much more when cranked, so it is wise to have a safety margin of Curious. Eddie and my zebrawood V in Dave's basement '77. Because this is the attenuator that goes down to 11. Get the latest news, reviews and features to your inbox. to the 1/4" Spk Thru jack. These devices are like oversized volume pots with dual wire-wound resistors inside. Webassociated with a tube amp. Here's a spreadsheet of the attenuation levels if my math is right, and to be honest I am making a somewhat educated guess so any input from you guys would be appreciated. It is used once to represent the attenuator itself, and also two times to represent a real speaker connected to the attenuator, and also a non-attenuated speaker direct to the amp. That should provide enough air flow to keep them cool and prevent them from touching the plastic box. So with everything soldered up I could install it all in the bottom half of the case and try it out. Build A Tube Amp Attenuator Diy Attenuator Tube AmpDo you have powerful tube/valve amp that you would love to crank up, but can't because its too loud for home? Guitar.com and Guitar Magazine accept no responsibility for damage suffered as a consequence of using our attenuator design and all Workshop tutorials are followed at your own risk. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Build and Test of the L2A Re-Amp Box byDIYRE, Guitar Amplifier Speaker Cabinet Luke Merwin Music. Various sources suggested values of 4.7uF and 10uF, but I found the 10uF capacitor too bright. load resistor goes to ground, but you could put an inductor in series with it, Is it pretty obvious? Construya un atenuador de amplificador de tubo Amplificador de tubo de atenuador de bricola\r\r? It does not have an XLR jack for the Spk Through. It is used once to represent the attenuator itself, and also two times to represent a real speaker connected to the attenuator, and also a non-attenuated speaker direct to the amp. Construction To simplify construction I used one of the plastic enclosures I had in my bin and used point-to-point terminals to suspend all resistors in the air. attenuator schematic WebLinks to power attenuator schematics and dummy load schematics. + 2db attenuating steps from -2db to -16db. Either way, one of the complaints levelled at L-Pad attenuators is the way they reduce treble content, with a knock-on effect on clarity as attenuation is increased. This is actually a more difficult task than one might assume. Now I printed out a pattern of dots that resembles a spectrum analyzer and basically my little logo thing. So maybe like me and have some sleeping babies at home, or maybe the sweet spot for tone on your amp is blisteringly loud, so in order to tame the volume on a tube amp an attenuator is what you need. Even with tube stages, for a bypassed common cathode stage the output impedance is the parallel combination of the plate resistance and the load resistance. never short-circuits to ground; the circuit with the switches in the position You are using an out of date browser. newsgroups search: "dummy load" and schematic - 9 hits, Deja Resistive loads ain't the same as impedance loads. Schematic In fact, plenty of commercially manufactured attenuators work exactly like that. Attenuator Level 1 Posts: 29 Tube Amp Attenuator?? I then plug my speaker wire from the amp to it and have an effective far as an AC signal is concerned. So here if we assume an amplifier input impedance of 100k then our worst case control input impedance will be 50k. DIY 100W Attenuator - any easy 'How-To Piotr Liskiewicz. From there, the level dials down smoothly until it vanishes altogether. It's better to use *more* resistance than Times when an artist basically ripped off their own songand it worked. I inserted the wire through the holes in the soldering tabs and then twisted them back around. Everything was fine so I tried it on a little crate tube amp, and that worked fine too. Even considering that all of you will forever see my rats nest I just dont think it is worth the effort, rest assured however that the wiring is correct and that the solder joints are solid. have the passion for the lick I need 20 takes to get! speaker load circuit, by Randall Aiken - duncan's amp pages. will show you how to calculate and build a resistive attenuator, often called a