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Aiken amps dummy load. Jul 14, 2020 · Sounds good.
Aiken amps dummy load. Suppose you have a 10 amp power supply and you want to confirm the 10 amp output through some sort of dummy load which can absorb 10 amp current. Remember to prioritize safety when working with dummy loads and electrical testing. Aug 16, 2006 · Just a simple dummy load shouldn't be expensive. Re: Enclosure for Aiken's Resistive Dummy load by Smokebreak3 » Fri Nov 08, 2024 1:58 pm Cool thanks for that. This can easily be done with a current probe and an oscilloscope, by cranking the amp up to just before clipping into a resistive dummy load. I know to make a dummy load to simulate speaker is hard. Once the amp is happy running into the normal resistive bench dummy load, it is then hooked up to a reactive load for the final stability testing. Yours Sincerely Mark Abbott nworbetan Posts: 111 Joined: Sat Jul 15, 2017 11:34 pm Gold Brick The Aiken Gold Brick is a speaker-emulating direct box designed to accurately reproduce the tone of a guitar amplifier and cabinet, without the need for a microphone. com> Newsgroups: alt Apr 27, 2012 · I'm getting some real good tones from both amps when using this dummy load with the line out. Id be careful picking the caps, as Mike says. I like the Marshall Power Brake for this because it is designed with no limiting of the high-frequency rise on the impedance (which is probably why they have a reputation for sounding buzzy), and can Dummy load circuit on Aikenamps websitePosts: 5,306 Maggie Logged Dummy load circuit on Aikenamps website #4 December 28, 2003, 12:08:26 AM Quote from: zonta tonegod what do you think about the schematic on aiken website? is it fine? my amp is a peavey delta blues and it is 30 watts. Good designs for dummy loads? by » Mon Jan 08, 2018 5:30 am I'm wishing to build a dummy load that can take the brunt of a SVT. Connected between the output of the amplifier and the speakers, the Gold Brick faithfully captures the tone, and most importantly, the feel of the amplifier and speakers. The bias adjustment is first set to the most negative voltage on the grids of the output tubes, and a 1kHz or 2kHz sine wave (depending on which "guru" you follow) is applied to the amplifier input. Are the coils and capacitors available from Europe as well, or only US? Re: Enclosure for Aiken's Resistive Dummy load by Smokebreak3 » Fri Nov 08, 2024 1:58 pm Cool thanks for that. Turn the volume controls all the way down (other control positions don’t matter). The ID-5252 contains four 8Ω, 60W power resistors. The biggest limitation of the Heathkit load is power handling. Both when sending it on to solid-state reamping into my 1x12" speaker cabinet, and when sending it into my Tonelab multi-FX and headphones. Easy enough to plug it into the speaker thru jack, which disconnects the internal reactive load. I have been planing to build a good dummy load box to my tube amp with a line-out, then re-amp with a quality Solid-State Power Amp into my. Mar 13, 2022 · How to Build a Dummy Load. If you are using a reactive load, the actual output power is equal to the voltage multiplied by the current, multiplied by the cosine of the phase angle between. I also read your > info on the need for high/low pass filtering and amplitude equalizers > when running a line from a speaker tap or dummy load to a separate power Apr 27, 2012 · Next an old Dm-2 was connected and it worked very well between the load box and the guitar input on the m-audio. Aug 31, 2025 · The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. I imagine that will be plenty, based on the sizes of boxes I've seen Feb 19, 2018 · There is a very limited use-case for having a dummy load on an amp without having any sound output, so why buy them, if it's just an expensive filter stage? Thanks, Re: Enclosure for Aiken's Resistive Dummy load by Smokebreak3 » Fri Nov 08, 2024 1:58 pm Cool thanks for that. This document provides circuit diagrams and specifications for several dummy load circuits designed to safely dissipate up to 200 watts of power from audio amplifiers. I guess the wattage ratings for the resistors are proportional to the square root of W/100 where W is the amp's power rating? Same for voltage The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. Yours Sincerely Mark Abbott nworbetan Posts: 108 Joined: Sat Jul 15, 2017 11:34 pm Aiken Amps Basically, you have the right two in parallel, which creates 2 ohms, then the next is 2 ohms and with the previous creates 4 ohms, then you add in another 4 and get 8, and finally another 8 gives you 16 (it's in reverse order to what I'm explaining, rightmost to left) The method, as proposed by several tube amp "gurus", requires the use of a signal generator, an oscilloscope, and a dummy load for the amplifier. Jul 28, 2024 · 0-44db rf attenuator circuit diagram Attenuator guitar diy diagram circuit switch workshop build own bypass basic hereGuitar amp attenuators and reactive load attenuators Diy reactive variable attenuator (demo and schematic inside)S53mv dds rf signal generator. Dec 3, 2024 · In the following post I have explained two straightforward dummy load circuits: the first one can be used for testing high current power supplies, and the second design can be used for testing large power amplifiers. guitar. IMG_1081. The usual practice, finding very high power low-ohms resistors, can be expensive. Or you can derate it to 20 watts if you're not using a heatsink. Testing with a different amp gives results much closer to the expected response. maybe I will just build it as designed. I use the large aluminum-encased ones. It has large heat sinks to which the resistors are mounted. » Thu Jul 26, 2018 2:41 pm Amp builders and repairers should have some kind of dummy load available. When you " recorded my amp's direct output with a dummy resistor load plugged into the speaker socket ", what kind of speaker sim did you use, IR or something else perhaps? An alternative for this Suhr reactive load is the Aiken Amps Dec 8, 2020 · An Aiken style reactive load has been on my mind for years. When you " recorded my amp's direct output with a dummy resistor load plugged into the speaker socket ", what kind of speaker sim did you use, IR or something else perhaps? An alternative for this Suhr reactive load is the Aiken Amps This can easily be done with a current probe and an oscilloscope, by cranking the amp up to just before clipping into a resistive dummy load. Series and parallel combinations can be used to So I now have a 100W dummy load switchable for 2, 4, 8, and 16 ohms. I hadn't really put any serious thought into it though until I got a CAB M+ recently. I am going to use aiken amps passive dummy load schematic using 8ohm 1% 50W resistors with switchable 4,8 and 16ohms. 6ohms when going through the switchcraft jack and the three way selector switch. You can use a 'load' resistor of proper ohms and wattage in place of the amps speaker. After some research Aikens design seems to load the Tube amp like a speaker would Apr 27, 2012 · When you compare the 2-coil and 3-coil load box on Randall Aiken's web site, you see that the 2-coil box uses a 16 ohm main resistor and that the 3-coil load uses a 13 ohm main resistor. This means that you need to pay special attention to the grounding of the output jacks and the output transformer. com> Newsgroups: alt Apr 13, 2017 · I want to build this dummy load as well, as my simple resistive box lacks tone and feel. Finally check out the GEO Tube Amp FAQ and Tube Debugging page. all-audio. Jul 14, 2020 · Sounds good. The worst case load for an amplifier is a purely inductive Or, consider a switch to disconnect one of the speakers. Guitar amplifiersCopyright © 2018, Aiken Amplification, Inc. Haven't done a head-to-head against a resistor load yet, but that would be easy to accomplish. Jul 26, 2020 · Re: Cheap DIY Dummy Loads by roberto » Wed Jul 01, 2020 6:13 am For bass amps or PA amps, electrical heaters in water are ok too: they are rated for kWatts. The main complaint about attenuators is that coupling a basic resistive attenuator to a reactive load will damp the peaks in impedance and the amp's response becomes too linear. I have some amps with no 16 ohm taps and frankly a smaller inductance was easier to source anyway. Very nice. The inductance is provided by an authentic moving speaker voice coil and motor assembly. It allows a guitar player to use their amplifier without a speaker connected, enabling silent playing, recording, or testing. JPG Hoffman Amplifiers Tube Amp Forum, How many of you think Aiken is credible? Reply #10 on: March 03, , am». You can make arrays of low ohms resistors and get the same power and more flexibility. I wonder how those numbers change for five 50W resistors. I like it whene I can hear myself breathe and have the amp on 10. The resistor Aug 31, 2025 · From: Randall Aiken <reaiken@mindspring. But what is a simple way to make a dummy load that is "similar" the the impedance of a speaker? I am not an expert, the most simple thing I can think of is a resistor of something like 4 or 5 ohm in series with a parallel combination of an inductor and capacitor. They are also nice to use when poking around and testing an amp with a signal generator for power output and you don't want any sound coming out. I have been planing to build a good dummy load box to my tube amp with a line-out, then re-amp with a quality Solid-State Power Amp into my Guitar Cab. Amp builders and repairers should have some kind of dummy load available. Aiken at NAMM show Randall Aiken - dummy load circuits Aiken Amplification - GoldBrick It's bad to run an amp into a dummy load of 8 ohm resistance instead of a speaker with an 8 ohm impedance because the speakers resistance changes with frequency, right. If you want to do silent recording, you can run the amp into a dummy load (a reactive load sounds much better than a resistive load). Jul 6, 2008 · Re: Dummy Load by M Fowler » Sat Aug 28, 2010 6:25 pm I looked down towards the bench the other day, measuring in an amp, and saw my dummy load chord had come unplugged from the amp. You can hear and feel a difference between reactive and resistive loads though the difference is hard to quantify. For testing an ST-70 100 watts would probably suffice, unless you plan to do prolonged tests at full power. The circuits use resistor networks and multi-position switches to allow selecting impedances of 2, 4, 8, or 16 ohms. About $50 in parts. Jul 9, 2021 · Aiken's Reactive Dummy Load. com> Newsgroups: alt Mar 23, 2024 · Aiken's Reactive Dummy Load. A dummy load is a piece of equipment used in place of a speaker when working on or testing amplifiers. The current probe is then clipped onto the plate lead of one tube on each side of the push-pull pair and the plate current waveform is inspected to determine if it is in cutoff for any appreciable amount If someone asked me what equipment should be in a workshop to do amp repairs, I'd say, good multimeter, a signal generator, a CRO, and a dummy load. ~Phil tUber Nerd! Designing Long-Tail Pairs - The Load Line Approach Designing Phase Shift Oscillators for Tremolo Circuits Designing Single-Stage Inverting Feedback Amplifiers Dummy Loads Frequency Response of a Marshall 4x12 Cabinet Grid Resistors - Why Are They Used? Idle Current Biasing - Why 70 percent? Is the Vox AC-30 Really Class A? Output Transformers Apr 27, 2012 · Yet, nothing can beat a REAL tube amp, no axe, no fx, no nothing. Sounds fantastic, and the amp responds the way it does when connected direct to a cab. It's built into the chassis of an old broken SS hi-fi amp I've had lying around. You could ask Randall Aiken about the lower limit of cranked-amp sound and whether 1 speaker permits better sound at the lowest level than 2 speakers. Tube amp bias circuit WATCH RELATED VIDEO: How To Dial In Your Guitar Amp The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. I rated the resistive load in this project at 500W (Two 33Ω, 250W in parallel) so I don't have to worry about failures of the dummy load - since it is so grossly overrated. Guitar amplifiers If someone asked me what equipment should be in a workshop to do amp repairs, I'd say, good multimeter, a signal generator, a CRO, and a dummy load. While it’s possible to just use some old heating elements or other big resis… Aug 12, 2024 · Aug 24, 2025 AlbertA M Passive Dummy Load for 50W 8 Ohm Amp Melodioso Jun 4, 2025 Amps & Cabs Replies 5 Views 284 Jun 6, 2025 May 25, 2023 · An audio load is an essential piece of test equipment for any audio electronics workshop. In addition to simulating the impedance of a speaker, a dummy load resistor also protects the The method, as proposed by several tube amp "gurus", requires the use of a signal generator, an oscilloscope, and a dummy load for the amplifier. Following is a plot showing the effect of adding a resistive load in parallel with the normal reactive load of a speaker, in an amplifier with global negative feedback (in this case, a Marshall 50W output stage). In reactive mode it very closely mimics the impedence curve of my most used cab. The real >> speaker will probably vary depending upon how hard it is driven, due to >> motional restrictions of the cone, which this circuit will not do. Use 8 Ohms for the dummy load and the resistive network for your output will be fine. It's a good idea to overkill the wattage. A dummy load is essential for testing amplifiers, and although there is really very little involved, setting one up properly (and cheaply) can become irksome. The dummy load is a switchable Aiken design with test pin jacks for a meter & 'scope, a la Ted Weber. I imagine that will be plenty, based on the sizes of boxes I've seen Nov 8, 2024 · Enclosure for Aiken's Resistive Dummy load by Smokebreak3 » Fri Nov 08, 2024 12:25 am May 26, 2020 · I got an itch to do a quickie quarantine project and decided to build a dummy load with switchable impedance. Feb 8, 2025 · 1) Connect your dummy load to the amp just as usual. When you have that resonance circuit, then above resonance (120 hz or so), that cap has to carry all the current of the entire amp output. The power resistors are absorbing the energy from the amp's output. By following the steps outlined in this article, you can create a resistive dummy load suitable for testing DC power supplies and low-frequency AC sources. I've used my CAE line out box for years going into effects,power amp and cabs, and speaker simulation would ruin the tone, as there is no need The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. I mounted the ones for my dummy load to a hefty Hammond finned aluminum project box and it'll still get toasty when running at near full power. com> Newsgroups: alt Thanks Torquil. I noticed the 8ohm resistor changed to about 9. Now, I can't stop thinking about how great it would be to dime the Trainwreck channel of my Bassman build at 1 AM. It employs a combination of inductance and resistance. And it's stereo. It is submerged in oil to allow somewhat extended operation during tuning or repair procedures. It is designed to safely dissipate the entire power of the amplifier. Like in the attachment. After some research Aikens design seems to load the Tube amp like a speaker would The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. Ensure reliable performance and protect your equipment effectively. Aug 24, 2022 · Just google "dummy load resistors" and they'll pop up right away, from Amazon or Parts Xpress or wherever. Tech equipment and a dummy load? by » Sun Apr 13, 2014 1:13 am If someone asked me what equipment should be in a workshop to do amp repairs, I'd say, good multimeter, a signal generator, a CRO, and a dummy load. com> Newsgroups: alt From: Randall Aiken <reaiken@mindspring. Also Re-Amped from the Line-Out into the Solid State mini power amp into my 2x12 Vintage 30's it sounds excellent only a little "flat". Bipolar caps are not expensive but I'd need to stack a bunch of them Aug 4, 2021 · Audio resistors ArtWall Jess Aiken's 'Little Jewels Words IV' 4 Piece Gallery Wr Shotgun safety switch AMP eSeries Season Two Round Two Review Lifetime QJ22B080H Siemens Molded Case Circuit Breaker 2 Pole 80 Amp 240V 42KA NEW Final Patio & Garden Services at Aiken Walmart Supercenter #514 Aiken's Reactive Dummy Load. Jun 27, 2023 · I am building a dummy load so I can plug the amp into it while using an oscilloscope to trace the signal of the amp. The inductor has value similar to the speaker and the capacitor the get the And for folks who don't mind spending a little more I got four 50w, 4R resistors, and a 4P3T rotary switch and made Aiken's 2/4/8/16R load box. Always Or, consider a switch to disconnect one of the speakers. A BNC sample O’Scope port is also provided as well as banana jacks to monitor the load voltage. Which of course means you're correct in assuming you can match them at low outputs and call it a day. Aiken at NAMM show Randall Aiken - dummy load circuits Aiken Amplification - GoldBrick Aiken Amps Basically, you have the right two in parallel, which creates 2 ohms, then the next is 2 ohms and with the previous creates 4 ohms, then you add in another 4 and get 8, and finally another 8 gives you 16 (it's in reverse order to what I'm explaining, rightmost to left) Unplug any guitar cords going into the input jack, and be sure to have a speaker or dummy load connected to the amplifier output. That's it. com> Newsgroups: alt. 09" thick. com> Below is a copy of a post I made a year or two ago on a reactive speaker load design. Apr 27, 2012 · I use the Dummy line-out to record with some Speaker Impulse Responses from Redwirez. I have all the parts already, need some help. Apr 27, 2012 · After some more testing it seems that the amp may have been the cause of the odd behaviour, not the load. I'm thinking of adapting this design from Aiken Amps for this purpose, but I'm having DummyLoad : Page1 I have been planing to build a good dummy load box to my tube amp with a line-out, then re-amp with a quality Solid-State Power Amp into my Guitar Cab. The volume level of the amp is then increased until This can easily be done with a current probe and an oscilloscope, by cranking the amp up to just before clipping into a resistive dummy load. Dec 28, 2022 · A good place to start is the datasheet for the resistor you plan to use. But since the grunt of the signal is absorb by the initial reactive load and the series resistance interact with the speaker reactance, response is maintained both from the speaker and the amp's point of view. If your amp is 50w, go with 100w. This circuit will make the amp react to the load, unlike pure resistive dummy loads, but if you want to tap off the input and send the signal to a board, or other equipment, you will need to attenuate it with a voltage divider, and filter it to simulate the frequency response characteristics of the amplifier. I'm only ever going to use this with small, home-made tube heads, 18W max. Vent your enclosure as the resistor will build up heat. I wasn't sure that I even wanted Jan 4, 2002 · No more worrying about mic placement. Apr 27, 2012 · Well, this thing is mostly the dummy load discussed in this thread plus a variable parallel path to the speaker. The red trace shows the same Jan 30, 2023 · 🇬🇧 just finished wiring this soon-to-be useful dummy load to work on tube amps more easily! 4-8-16 Ohms - 300W max, it should be good for at least a few Mar 30, 2021 · The main goal was to build a dummy load that could handle similar amount of power in a smaller and more “desktop friendly” package (which means forced cooling). However, the Gold Brick is not a dummy load! You must have a speaker or load box connected to the amp. >> This circuit will make the amp react to the load unlike pure resistive >> dummy loads, but if you want to tap off the input and send the signal >> to a board, or Jan 15, 2005 · If someone asked me what equipment should be in a workshop to do amp repairs, I'd say, good multimeter, a signal generator, a CRO, and a dummy load. time chart so you always know how much power it can handle and for how long. I use it all the time when I'm checking the power output on an amp or just need a load for the OT. If I can use lower spec components, the cost could be cut. DummyLoad : Page1 Nov 16, 2020 · Aiken's Reactive Dummy Load. Dec 2, 2014 · Re: Good designs for dummy loads? by pompeiisneaks » Mon Jan 08, 2018 7:44 pm I did a dummy load based on schematics on aiken amps site here: There's a typo I think on the layout I did on my site, I put one of the wrong resistances but basically the idea is very simple. So from this you can see that the 3-coil relies more on the reactance from the extra coil to come up with the reactance lost by the resistor being downsized. It's the volume sweet spot along with the negative feedback and the presence control into a reactive load, that make the amp sound and respond to ones playing just right, and don't tell me a modeler can do that, I've tried them all. Re: Dummy Load M FowlerSat Aug 28, 2010 6:25 pm I looked down towards the bench the other day, measuring in an amp, and saw my dummy load chord had come unplugged from the amp. This amp can drive a speaker directly, but suddenly, I have completely switched from the hypothesis that the speaker should be driven directly by power tubes, to the conclusion that they should actually be separated, for more control of both the Tone and the SPL (sound pressure level). Apr 27, 2012 · Anyway, I tried this load with my dual rectifier in modern mode (no negative feedback in power amp when in modern mode), reamped though a solidstate power amp into guitar cabs. This is one of the simplest projects on the ESP site, but it will perform extremely well. By default, current gets split in two, half goes through the reactive load, the other half through a resistor and the speaker (like a single speaker in a quad box, so -6dB = 1/4 of the power). 2) Wire the 270R resistor in series with your speaker by connecting one end of the resistor to one of the speaker lugs. It uses a number of non-inductive resistors in parallel to achieve 50 Ohms over a wide frequency range. Dummy Loads Dummy Loads - what are they? A dummy load is a piece of equipment used in place of a speaker when working on or testing amplifiers. It is important not to use the chassis for this return path. For example, in a 100W amp, the secondary current into a 16 ohm load is 2. Summit amps has a " how tubes work " paper. I have not made any edits to the text, but the pictures have been redrawn (hopefully correctly!) from their original ASCII art representations. Apr 27, 2012 · I agree its the amp, what I was trying to answer was whether the measured curves change under high output conditions, which they do, and would the speaker load and the load box exhibit similar changes in their measured curves, which they do. Notes provide recommendations for resistor types that can handle the power and warn that the switches may not Building the Dummy Load This is a take-off on a Dummy load that I've built in many different forms over the years. I imagine that will be plenty, based on the sizes of boxes I've seen Jul 3, 2006 · ok, I know a bit about the ideas behind dummy loads and such, but I want to make sure I wouldn't be killing my ampeg to do what I'd like. If you're looking for an attenuator, that's a bit different. I imagine that will be plenty, based on the sizes of boxes I've seen Re: Enclosure for Aiken's Resistive Dummy load by Smokebreak3 » Fri Nov 08, 2024 1:58 pm Cool thanks for that. Apr 27, 2012 · My experience is that it’s greatly dependent on the amp. Hi r/diytubes! As I, like most people, am spending a lot more time at home, I'm looking at building a reactive dummy load to run my tube amp into with a line level output to be able to run it direct into an audio interface and a DAW running impulse responses to have a silent recording and practice solution. The plan was to use the Aiken schematic that used a 3P4T with 4 x 4R/50W resistors to provide 2-4-8-16R loads at 100W (top right). I built the Aiken circuit load as per the first post in this thread and included a switch to short out the reactive element so it’s purely a 7. Having created the very popular Heathkit ID-5252, more than 35 years ago, Gary Galo decided to design a new option for everyone to build now. Whew the OT didn't get hurt, thankfully. I'm new to all this. The method, as proposed by several tube amp "gurus", requires the use of a signal generator, an oscilloscope, and a dummy load for the amplifier. Aiken at NAMM show Randall Aiken - dummy load circuits Aiken Amplification - GoldBrick The method, as proposed by several tube amp "gurus", requires the use of a signal generator, an oscilloscope, and a dummy load for the amplifier. Thank you to Randall Aiken and James Freeman for engineering and tuning in this load box so well. The model in Aiken's schematic is pretty easy to find. May 10, 2021 · It’s based on Randall Aiken’s reactive load design with the values scaled to a nominal 8 ohms. The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. I noticed what sounded like considerable ground noise and lifted the ground on the amp and the noise went down to zero. amps Subject: Re: proper dummy load on output of tube amp? Date: Sun, 13 Dec 1998 00:49:05 -0500 Organization: MindSpring Enterprises Lines: 159 Message-ID: <36735551. DummyLoad : Page1 Dec 2, 2014 · Cheap DIY Dummy Loads by R. Dummy loads are useful for determining maximum amplifier output power and for "burn-in" of an amplifier under full power for several hours or days to insure reliability before the amplifier is sold to a customer, or Designing Long-Tail Pairs - The Load Line Approach Designing Phase Shift Oscillators for Tremolo Circuits Designing Single-Stage Inverting Feedback Amplifiers Dummy Loads Frequency Response of a Marshall 4x12 Cabinet Grid Resistors - Why Are They Used? Idle Current Biasing - Why 70 percent? Is the Vox AC-30 Really Class A? Output Transformers > on your product as compared to the THD and Powerbrake. Feb 11, 2020 · When it comes to testing power supplies, it’s useful to have a dummy load to put the gear through its paces. A dummy load is a piece of equipment used in place of a speaker when working on or testing amplifiers. So, I traced the schematic, then tinkered somewhat with LTSpice and came up with the following modifications: *Measurement point is between the load resistors R2 and R3 Apr 27, 2012 · After a few years of using this dummy load with a 200 uF capacitor, these new measurements showed that the nominal input impedance was actually quite high in the flat region between 300 Hz and 1 kHz, around 11 or 12 Ohms. But there is another way. Feb 21, 2011 · Rewire for the impedance rating of the amp, eight ohms, not whatever, 8 Ohms. It is even higher into a 4 ohm load, at 5A. Tube amps are often hyped with odes of "musical" and non-discordant low order even order harmonic distortion, coupled to nice DRAWN pictures portraying sine waves that distort smoothly at both half waves. So I added a 100 uF for a total of 300 uF which gave the more reasonable result below, around 9 Ohm. The current probe is then clipped onto the plate lead of one tube on each side of the push-pull pair and the plate current waveform is inspected to determine if it is in cutoff for any appreciable amount Or, consider a switch to disconnect one of the speakers. The label on the dummy load includes a power vs. May 28, 2005 · Wish I had the collective wisdom of this forum 15 years ago when I blew up a solid state amp by using the recording outputs without the speakers plugged in and no dummy load. Guitar amplifiersDesigning Long-Tail Pairs - The Load Line Approach General The Marshall/Fender phase inverter is commonly known as a "long-tail pair", or "Schmitt" type phase inverter, or phase splitter (actually, the original Schmitt inverter was a differential pair with a large "tail" resistor; the "standard" guitar amplifier phase inverter is a self-biased version of this circuit that Yes. I built Randal Aiken's dummy load. pro › topic › all-audio. In fact, the opposite is true - a purely resistive load dissipates all the amp's power in the load, while a reactive load varies the dissipation between the load and the output tubes, depending on the phase angle of the reactive component of the load. Aiken Amps has schematics if you're interested in making a switchable 4, 8, and 16 ohm load or similar. Still needs the reactive part to sound natural. pro. com> Newsgroups: alt Apr 27, 2012 · This is incorrect, for slaving into another amp and cab you don't want speaker simulation at all. Fantastic! Now go to AMPAGE and see how much more you understand! Dec 15, 2010 · A: A resistive load is not any worse than a speaker load or reactive attenuator load. For recording direct yes, but not for a live rig. The current probe is then clipped onto the plate lead of one tube on each side of the push-pull pair and the plate current waveform is inspected to determine if it is in cutoff for any appreciable amount Jun 7, 2024 · Conclusion Making a dummy load for testing is a straightforward process that requires a basic understanding of electrical principles and components. Aiken Soak>> impedance variations you get with a 16 ohm speaker cabinet. Learn how to use a dummy load with ham radio for accurate testing and safe operation. I'm looking at getting a red box, for DI live and for recording and, ideally, for silent practice if I stick a dummy load in the speaker thru jack on the box. Aiken Amplifcation by axeman » Tue Mar 03, 2009 10:51 pm Trying to build a 4, 8, and 16 ohm dummy load. From: Randall Aiken <reaiken@mindspring. While at it I wanted it to have standard banana jacks, two independent load channels, and a switch to select between 4-ohm and 8-ohm modes. Anyway, maybe the line output is a little bit anemic with lower-powered amps. The green trace shows the response of the amp when driving an 8 ohm reactive load, with the amp set for an 8 ohm output impedance for correct matching. I have a 100w 8ohm resistor dummy load. Very simple5 power resistors, wired up to a 3-way switch to provide different impedance (and power) options, and a jack. What Is A Dummy Load Resistor for a guitar amp? A dummy load resistor is an electrical component that simulates the impedance of a speaker in a guitar amplifier circuit. To check stock and purchase products, click on the "Amporium" button in the navigation bar. However, I don't think I can find a 3P4T switch that I've been doing some research over the past few days to either buy a guitar amp load box (dummy load) or build one, and it seems that it's much cheaper to build one (~$50). I want the load to at least be able to handle 4 ohm, 8 ohm, and 16 ohm outputs. AFAIK all you really need for the interior is a resistor of the appropriate ohm rating and wattage rating. 5A. Certainly it wouldn't be a 60"x60" box I've got a chassis kickin around here that's 16"x 7" and . 5 ohm resistive load. After some research Aikens design seems to load the Tube amp like a speaker would Apr 27, 2012 · This thread and Mr. You do not have the required permissions to view the files attached to this post. Most of this sort of thing is commercially available with the exception of the dummy load (though Weber's loads are a good alternative). I have no idea what that 32 ohm stuff was about. Thanks for your assistance. com> Newsgroups: alt Apr 27, 2012 · Then again, pick any classic puh-pull tube amp and it's main components generating tone will likely be all those "atrocious" things. I added the line out tap. Aiken's reactive load design inspired me to take a look at the wiring of my unit and see if I can do something to make it work the way it's supposed to. G. For this, you would have to build Jul 6, 2005 · There is a lot more, check out Aiken Amps for lots of info and links to ther places. 4BEA@mindspring. The volume level of the amp is then increased until Good designs for dummy loads? by » Mon Jan 08, 2018 5:30 am I'm wishing to build a dummy load that can take the brunt of a SVT. Mar 12, 2020 · Ameritron’s ADL-1500 Dummy Load allows you to run the maximum legal limit of 1,500 watts for a full five minutes. You can wire those same 4 resistors in series/parallel and do this correctly. com> Newsgroups: alt The following is a great post reproduced with Randalls permission, which looks at this issue and prescribes a couple of different passive networks that provide a real world load to your amp. would that circuit be ok for it? and do you think that it would sound good? i appreciate if you have other 5 days ago · Does anyone happen to still have the Aiken Amps cabinet switcher schematic? The site that held those documents seems to have been down for awhile and the only material I can find points to their dummy load schematics or amp head switcher, but I would specifically like to have an A/B switch to select between two cabinets while using one amp head. Brad The Tru-Load is a bench dummy load for testing amps. Version 2. emcib hqgxf ijamkm rfidl hygykr utbkbrv xxweo nrrfas kutcgvui cxr