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Alpha Nirvana 39w 8ohm Class A Amp
Alpha Nirvana 39w 8ohm Class A Amp
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Old 15th October 2021, 12:22 PM   #1841
xrk971 is offline xrk971  United States
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Alpha Nirvana 39w 8ohm Class A Amp
Quote:
Originally Posted by andyr View Post
But surely, X - if the very clever red 'clip LEDs' on the AN never flicker on - even on transients, when listening louder than normal - 100w will be of no benefit with my current spkrs?

Andy
It depends on the sensitivity of your speakers. Mine are 82.5dB and occasionally clips on crescendos with 40w. Your Satori array speakers are probably way more efficient so you might not need 100w headroom. After all, it’s just a bit more than 6dB above 40w. It is 60% efficient at full power though but that just because there is a choke loaded output which boosts voltage swing.


@Aksa:

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I realised that replacing the lower output device with a pmos rather than a nmos you could define the voltage output at a far greater linearity than the original Aleph J. I recognised Nelson designed his Aleph for musical colour, but it had quite distortion, and the output voltage accuracy was set by the negative feedback loop. With a pmos in place of the lower nmos, you could reduce thd by maybe 10 times and simplify the swinging CCS so it could adjust to any load. These are eureka moments in our lives
This may be arrangement of existing ideas, and such is the basis of most inventions, but Hugh, you are much too humble and I’ll say that it was pure genius on your part. Bravo and thank you for giving us this amp!
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Old 15th October 2021, 12:23 PM   #1842
Samuel Jayaraj is online now Samuel Jayaraj  India
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Wow Hugh. My respect and appreciation to a fine Amp Designer and a Master Wordsmith, ever so gentle, kind and never condemning. You have captured your entire Audio Life Journey, so succinctly in a couple of paragraphs, paying tribute where due, to the great Nelson Pass.

All that has been said of the AN by you and others in the last few comments, inspires me to build the amp. I have a few Pass and Juma amps. I have one pair of Tokins and LU1014s from the Pass giveaway group buy with X's aluminium PCBs. I turned down the second lottery VFET amp, due to shipping/customs hassles and 10watts being low power for my needs.

I use Fostex FE168ESigmas in ML TQWT cabs and they sound great on my system. All my amps are Zero NFB and resultant low DF.

Question is, would the ANs do well where low DF shines? Thanks in advance.
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Old Yesterday, 04:37 PM   #1843
xrk971 is offline xrk971  United States
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I ran across this silent PC chassis that can handle up to 95w of dissipation. Perfect for an Alpha Nirvana monoblock. It’s not bad looking either. At $155 is well priced. You would just need to make a panel on back for binding posts and RCA’s.

I do wonder if the 95w rating is for continuous run though as most PCs run lower power and shorter periods run peak power. Needs more investigation.

Streacom FC8 ALPHA Series Fanless Home Theatre Aluminium Chassis

Click the image to open in full size.

Click the image to open in full size.
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Old Today, 12:27 AM   #1844
thorstenlarsen is offline thorstenlarsen  Denmark
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Quote:
Originally Posted by xrk971 View Post
Your Satori array speakers are probably way more efficient so you might not need 100w headroom. After all, it’s just a bit more than 6dB above 40w.
Hi X!
No! It’s a bit more than 3db above 40w. Two times the power is 3db. Two times voltage is 6db. But two times voltage to a loudspeaker gives two times current too, which gives four times the power.
Just a reality check.
Thorsten
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Old Today, 12:56 AM   #1845
xrk971 is offline xrk971  United States
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Yep, my mistake. 40w to 100w is 4dB increase I think.
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Old Today, 03:19 AM   #1846
andyr is offline andyr  Australia
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Quote:
Originally Posted by thorstenlarsen View Post
Hi X!
No! It’s a bit more than 3db above 40w. Two times the power is 3db. Two times voltage is 6db. But two times voltage to a loudspeaker gives two times current too, which gives four times the power.
Just a reality check.
Thorsten
Quote:
Originally Posted by xrk971 View Post
Yep, my mistake. 40w to 100w is 4dB increase I think.
Irrespective of the maths, I suggest that if my clip LEDs never go on with transients - even when listening louder than I normally do - it shows that my spkrs do not need any more headroom than what is currently available to them.

So a more powerful amp is simply not necessary.
Andy
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