GaN amplifier from GaN themselves limited supply!!!
For those wanting one, here’s a place (subsidiary of Arrow Electronics) that has 5 of them, and they’re cheaper here too, only $940!!! https://www.richardsonrfpd.com/Products/Product/GS-EVB-AUD-BUND There must be others as GaN has about 50 outlets world wide on the GaN where to buy page, bottom of this page. https://gansystems.com/where-to-buy/ Cheers George |
What is going on with this thread? The moderation appears peverse. The OP was misbehaving and got defensive. Then everyone else's posts got removed? What a strange place this is. Reminds me of the Tekton thread where any opinion on the speaker's appearance was removed. So we can discuss components but not their appearance? It seems some, rather shrill in tone posters, get to wag the dog |
None of my posts have been removed. The fact that these have sold out is probably not due to popularity in the high end audio community so much as GaNFETs are hard to get right now and there probably isn't stock to build the evaluation boards. When you can't get the product to sell, why in the world would you populate a promotional product?? I noticed George repeating himself in his quotes from Amirm but oddly he leaves out Amirm's concluding remarks so here they are from Amirm's website: ConclusionsNote the last two statements. Although George was rankled by this he didn't let on here on this website. He asked Amirm only a few days ago (most of the thread is from June) about changing the feedback to get better measurements- here's what he asked (on page 7 of the review) https://www.audiosciencereview.com/forum/index.php?threads/gan-systems-amplifier-eval-board-measurem... Any chance of doing the couple of measurements again that didn't impress like the others did, but with the feedback set up higher where you think it should be, as this may well flip your conclusion around??.Obviously George is aware of Amirm's conclusion. Amirim indicates that he is concerned the evaluation board will go into oscillation if too much feedback is applied (for those technically minded: with too much feedback the phase margin of the circuit would be exceeded, resulting in oscillation). This is a clue into the design of the circuit. It indicates that its not self-oscillating. Since it can also be run with zero feedback (see measurements on page 1 of the review) this suggests a straight forward Pulse Width Modulated encoding scheme. A PWM encoding scheme with no feedback has noise associated with frequency drift in the triangle wave oscillator. For this reason the oscillator has to have a lot of attention paid to its stability, but the simple fact is it will drift. You can see the result in the noise spectrum which is the final measurement Amirm shows. One more thing: If you note the 4 ohm power measurement as opposed to the 8 ohm power you see that its actually **lower** (114 watts) than the 8 ohm power! This is not a mistake. I've already said why earlier on this thread- because the eval board is for evaluation only its not supplied with heatsinking means. Heatsinks that can actually allow the amp to run at full power into 4 ohms are not a trivial cost- they would be the most expensive part(s) in the kit due to the precision machining required. So the amp is teamed with a SMPS unit that is unable to provide the current needed into 4 ohms (and is probably actively current limiting). This prevents the board from overheating its output devices. So if you are planning this amp as your power amplifier, just be aware that its really only 114 watts into 4 ohms. |
