Another marketing gimmick?

2034 @ your local Best Buy:

The GaN FET 'tube tester'....*L*

(You can say you saw it here, first...*L*)

Don't know if you're old enough to know or remember the 'tube testers' that were occasionally at local markets.  The better versions had a meter to give one an idea if it was 'marginal enough' to make it through the next football or baseball broadcast....

It'd generally punk out 3rd quarter.....*L*

If evacuated of air it would get hotter. There are some gases that would improve thermal transfer to the glass, but thermal conductivity of gases is inversely proportional to molecular weight, and they escape easiest .... i.e. helium and hydrogen. Neon may be a reasonable compromise. There are some more esoteric ones out there. Most of the heat transfer is because of the gas moving due to diffusion and chimney effects from the hot electronics.  With the electronics in a sealed enclosure like this, most of the heat transfer will be radiative.


Nitrogen is not a noble gas. It also does not make your tires run any cooler. That is an old myth. It may from a practical standpoint in that it escapes slightly slower than plain air so better chance your tire is properly inflated, but that's it.

The device I use was developed very specifically for class D audio, not for power supplies, low voltage points of load or RF circuits.

Yes, others use GaN devices but not the ones he worked on with the supplier and he bought out all the inventory. I don't know where you got the notion that the circuit is obsolete unless it was meant to demean. 

He's devising a new one to deal with the increased power of his next amp. Going back down in power doesn't appear to involve modifications. That, and although other makes use some form of GaN device, they're not intended for audio, like his are.

And, yes, I took some poetic license in saying that it was for radar as I was lazy to not list all the other applications. You're quite the pill, aren't you?

All the best,
Nonoise

The GaN device he is using is obsolete. That is why he had to buy up all the inventory. That is why he needs to switch to a new one for the next gen devices. Designed for class-D audio is specious. Designed for a particular implementation of Class D audio would be more accurate. That does not mean that new generic devices are not more appropriate to Class D either. When he says power supplies does he mean high voltage supplies as mentioned elsewhere in the article (or website) or the new low voltage GaN FETs that are low cost and very high performance? ( And could be why the old part is now obsolete, too expensive and not good enough). It’s sort of like power supply electrolytic audio capacitors. They used to be "superior" but circuit dependent a new low ESR, high temp, high life capacitor will be superior.


His circuit may be awesome and I am happy to see he is not running with blinders to the highest switching frequency at the detriment of other properties (as certain people promote), but also note he is switching much lower than say Cherry who does it with silicon transistors and has well respected sound (at less money).


And no, using "radar" makes you the pill, not me. If you were up on low voltage GaN for power supplies you would have said that but sure, claim someone else is the problem.

Using "radar" and providing the link with the attribution shows I was just lazy. Nothing more.

Your needling every and any point to better others shows you to be an audio (and carpet) harpy of the highest order. I think you’ve found your niche.

Carry on.

All the best,
Nonoise