I have the first I believe Maya200 from Hugh.
I've been burning it in over Christmas after Aussie Post lost it for 9 days silly silly wombats.
I must say it sounds very musical and powerful sounds like more then the 250W it pushes into 4ohms.
The low end driver grip is very strong and the sound stage is very wide.
No fatigue or SS glare at all tube like but with power.
Looking inside there are only two output devices per side for each channel.
I'm very happy with this AMP much better then the Bryston SS7T's it replaced.
Happy New Year
Thank you Garry! I am very pleased you put the Maya in such good company, this is quite a pressie for 2016! The output devices are BIG, they are rated EACH to 480W. It took some time to figure out how to use them, they are extraordinarily robust.
You are the second Maya customer, in fact! I have a few more on queue right now, pity the weather in Melbourne is HOT at present; 39C today.
A very Happy New Year to you and your family - 2016 will see some changes in the world I'm sure.
Happy New Year to you Aussies
Hugh,I'm realy hoping the Maya travels the world
The cat is poking it's head out of the bag now. And 2016 is the year of the Maya Amplifier. I'll leave it to Hugh to fully get the cat out of the bag at the proper time.
However, I have been building and listening to prototype versions of the Maya for several months while Hugh continued work on the final product. This is a special amplifier with wonderful sound and spatial qualities that are easily heard with all genres of music. I continue to be amazed at every single listening session, which is most every day.
Yep, Steve is on the money...... and my sincere thanks to him for incredibly patience taking the Maya through its paces to ensure it will be utterly reliable and durable. We are both at last happy with this long gestation!
As most realise, I'm a lousy salesman, but this does mean that I understate most of my comments and you can be quite sure my descriptions are precise and up to date!
I'm listening to a 50V Maya at present, on classical guitar. This amp will be released with 62V rails, which relates to an easy 210W into 8R and much more, depending only on the transformers, into 4R, at least 300W. The topology is unique, different to the NAKSA, and the flagship for Aspen. I will be offering the modules for $AUD2250, which is $USD1642 on the present rates. This is actually pretty much the same as the original N125, which was sold at $AUD1620 when the Oz dollar was almost at parity, so in a sense it's a lineball price, and much more technology and performance.
SS relay speaker protection, which tripped with more than +/-2V DC on the output.
Soft turn on and fast turn off for the speaker.
29dB of global feedback, delivering wonderful spatial characteristics, viz sound field.
Blinding speed; the amp is limited with a low pass filter on the input, but will deliver real power up to 150KHz. Quiescent is 125mA, and total dissipation of output stage is up to short term 940W.
Very low THD, less than 0.025% into 200W, and very low noise, lower than -105dB.
Very low odd order harmonics in the distortion profile; this is the primary aim in this design, which is supernaturally musical - tube grace with SS muscle.
Attached is the module, which is double sided on 2mm black FR4 and 70 microns copper. Every attempt has been taken to address all detail in the layout of a SOTA Class AB amp.
I am now finishing the documentation, but I will not be publishing the schematic!
The SS7t would be a Carver amplifier if I'm not mistaken, or is it the Bryston 7B sst?
I found this at Enjoythemusic, by Dwayne Carter:
I await Garry's reply, but this is, I think, the amp he owns. He told me it was a Bryston, and it's a very well made amp with good figures. These are well made and a technical de force, with a patented, clever and elaborate output stage. I understand they have been around for more than ten years, and VERY powerful.
Colin, as you know, and you go for this too, I'm trying to peel back the subjective listening experience with my designs. In 50 years SS has been obsessed with technical specifications, particularly THD, and I discerned that there was a place for going to the sound quality, assessed by critical listening tests. This is why Pass' amps, JLH's Class A, Le Monstre from Hiraga, and the recent DartZeel from Delacretaz really pricked my ears. My recent amps are designed in the ethos of all these amplifiers.... regardless of specification, which is pretty good but not exceptional.
Thanks for your post, and Happy New Year!
Out of curiosity, why did you choose FQA40N25 instead FQA28N15 as a FQA36P15 complement...FQA40N25 has ~1/3 higher gfs and parasitic capacitance than FQA36P15?
Happy New Year
Happy New Year to you!
I use much bigger, 480W mosfets for the Maya, and yes, they have much higher transconductance and parasitic capacitances. The NAKSA 125 uses 280W devices.
I could fill a page on this; it's my stock in trade for the last twenty years. Firstly, higher transconductance means there is very little change in Vgs on these devices over the full waveform, and the Cgs (input capacitance Ciss) is bootstrapped by a common source configuration. These devices have transconductance around 25S plus, where bipolars are markedly less (typically 20S for a C5200), so the waveform compression of mosfets is generally superior to equivalent bipolars by 1:1. A single pair of very large mosfets are superior to multiple pairs of bipolars; more resolution and easier to drive (no gate current). It is much easier to drive large mosfets than most expect, and in fact I found using drivers increased phase shift and gave no subjective improvement in sound. We are working with audio, not radio frequencies, and up to 20KHz a high driver current is more than sufficient drive. In fact, the Maya will do huge output to 100KHz and beyond if not fitted with a mandatory LP filter.
There are some dark secrets in using mosfets in this way. They are skittish devices, inclined to self-oscillate. Robert Cordell helped me from a 1984 white paper on these fascinating devices. These days I would not use anything else, and we can thank SS traction technology for this; hybrid electronics use them in VFD modules.
Thanks Steve, absolutely, different devices, and we think, you and I, that the bigger mosfets sound as good and even a bit better.....
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