# QA403 Dummy Load on Air :) **URL:** \ **Category:** Uncategorized\ **Created:** [April 13, 2025, 1:56pm UTC](https://forum.quantasylum.com/t/qa403-dummy-load-on-air/1807 "2025-04-13T13:56:32Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Etheraudio](https://avatars.discourse-cdn.com/v4/letter/e/e5b9ba/32.png) [@Etheraudio](https://forum.quantasylum.com/u/Etheraudio)\ **Post date:** [April 13, 2025, 1:56pm UTC](https://forum.quantasylum.com/t/qa403-dummy-load-on-air/1807/1 "2025-04-13T13:56:32Z")
Hello, we are sharing this dummy load that we made following this post: [Measuring Power Amps · QuantAsylum/QA40x Wiki · GitHub](https://github.com/QuantAsylum/QA40x/wiki/Measuring-Power-Amps) . Unlike the original, this one is dual-channel, mounted on a heatsink, which may not be necessary, but so the load can be used for extended power tests (generator idle mode). Everything is controlled by a flip-switches. Greetings from Bulgaria > **[Etheraudio | Etheraudio](http://www.etheraudio.net)** ![dummy load 1](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/2/280b37e43058e5fdad86e85655dc5a89abe08306.jpeg) ![dummy load 2](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/7/7a5ccee86a088f70965bbd50dd5edab40729c531.jpeg) ![dummy load 3](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/7/70fa5fbeb2e5f77f3a4f5b6a19c4bc647671aedc.jpeg) ![dummy load 4](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/5/5216fe672174010b740005886cf17d6415456967.jpeg) ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [April 14, 2025, 2:16pm UTC](https://forum.quantasylum.com/t/qa403-dummy-load-on-air/1807/2 "2025-04-14T14:16:33Z")
Hi @Etheraudio, very nice! How are you liking the Arcol loads? I think they are really nice compared to the normal yellow/gold chassis mount. What is the max power you have pushed into your load? ---
**Author:** ![Etheraudio](https://avatars.discourse-cdn.com/v4/letter/e/e5b9ba/32.png) [@Etheraudio](https://forum.quantasylum.com/u/Etheraudio)\ **Post date:** [April 16, 2025, 3:53pm UTC](https://forum.quantasylum.com/t/qa403-dummy-load-on-air/1807/3 "2025-04-16T15:53:16Z")
Hi @matt, thanks! We haven’t put much strain on this dummy-load yet (our amps are tube amps with power of ~50W and most of the cases ~20W). I’ve run one of these Arcol-resistors without any heat-sink at about 50W, but as far as the QA403 was testing the amp, which I measured with short pulses/samples, the load didn’t get hot at all. So far we haven’t used such resistors, but mostly yellow/gold mentioned by you. When we load it in idle mode with more power, I’ll share observations. P.S. QA 403 is a great tool ! Thank you! ![magic20](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/a/aaabe0db4796177166314f0d516059b94c2a249a.jpeg) ---
**Author:** ![Etheraudio](https://avatars.discourse-cdn.com/v4/letter/e/e5b9ba/32.png) [@Etheraudio](https://forum.quantasylum.com/u/Etheraudio)\ **Post date:** [April 27, 2025, 12:24pm UTC](https://forum.quantasylum.com/t/qa403-dummy-load-on-air/1807/4 "2025-04-27T12:24:55Z")
Hi @matt, yesterday the dummy load was pushed beyond…and it behaved very stable: ![dummy load temp](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/4/4f8dd240b42faf5129b825d03e938da8a5735781.png) ![THD_1 794 W 4 Ohm](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/f/f9fd1be9f055179aab348a791c5721f1ecb05b4b.png) ![THD_1 843 W 4 Ohm](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/6/6c07c3eeab3cb4a6b53049db9e0e68060d4d1046.png) It have been tested even with idle mode gen for about 10-15 seconds .and it was ok Regards!