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Alpha Nirvana 39w 8ohm Class A Amp
Alpha Nirvana 39w 8ohm Class A Amp
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Old 22nd May 2020, 08:19 AM   #1251
andyr is offline andyr  Australia
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Finally, I am listening to the first of my AN 4Rs! It's powering my 3.2 ohm mid panels.

Dead quiet – thank goodness (through the speakers)! So the fact that the 240v mains feeds to each traffo:
• pass along (and near) the -ve side of the L channel SLB and the +ve side of the R channel SLB,
• and crosses some of the earth cables at the chassis bolt

… has not caused a problem! So now I can solder each mains active wire onto its NTC lead (I had croc-slipped them, in case I had to put these mains wires into an earthed shield).

And I don’t think I can hear fan noise at the listening position (which is all that matters)!

It’s running a bit hotter than I had measured before (when I had no spkr load):
• R & L P-channel MOSFETs (the edge) are 40 & 41 deg – whereas before, I measured 30 & 33 deg
• the back of each CPU cooler bracket is also 40 & 41 deg – whereas before, I measured 33 & 37 deg.

Traffos are ever-so-slightly warm.

Turning up the volume louder than I normal listen at … no sign of the red clip LED! (Even though this amp is ~half the power of the de-rated N80s that I’ve been using.) And turning up the volume … does cause heatsink temps to drop a bit!

Listening to an LP - Joe Cocker "Sheffield Steel" (MFSB). Very authoritative and detailed mids. But I'll turn it off in a while and, tomorrow, I’ll swap the AN to my (2 ohm) ribbons. That will be the "torture test"!

How do I get the clip LED to light up? Do I have to use a sig gen to feed it a mid-range signal (say 1500Hz) and put a dummy load on the amp, so I don't ruin my mid drivers when the clip LED lights?

A very happy Andy!

Last edited by andyr; 22nd May 2020 at 08:25 AM.
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Old 22nd May 2020, 09:22 AM   #1252
jacques antoine is offline jacques antoine  France
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Quote:
Originally Posted by andyr View Post
Finally, I am listening to the first of my AN 4Rs!
You made it ! Congratulations Andy !!
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Old 22nd May 2020, 10:07 AM   #1253
ItsAllInMyHead is offline ItsAllInMyHead  United States
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Alpha Nirvana 39w 8ohm Class A Amp
Congratulations!!!

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Old 22nd May 2020, 11:23 AM   #1254
minek123 is offline minek123  United States
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Quote:
Originally Posted by andyr View Post
Finally, I am listening to the first of my AN 4Rs! It's powering my 3.2 ohm mid panels.
Congrats!
Enjoy the amp.
It's been a journey...
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Old 22nd May 2020, 11:25 AM   #1255
andyr is offline andyr  Australia
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Originally Posted by jacques antoine View Post
You made it ! Congratulations Andy !!
Yes, finally! Thank you, Jacques.

Andy
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Old 22nd May 2020, 11:29 AM   #1256
andyr is offline andyr  Australia
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Quote:
Originally Posted by minek123 View Post
Congrats!
Enjoy the amp.
It's been a journey...
Yes, it's been a loooong journey.

However, #2 should be quicker.

Quote:
Originally Posted by ItsAllInMyHead View Post
Congratulations!!!

Thank you!

Still interested to know the best way of firing up the clip LEDs.

Andy
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Old 22nd May 2020, 12:19 PM   #1257
Vunce is offline Vunce  United States
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Yahoooo Andy!!
This has been some long journey, but you’ll find it was absolutely worth the wait.

ENJOY!!

Cheers,
Vunce
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Old 22nd May 2020, 12:21 PM   #1258
andyr is offline andyr  Australia
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Originally Posted by Vunce View Post
Yahoooo Andy!!
This has been some long journey, but you’ll find it was absolutely worth the wait.

ENJOY!!

Cheers,
Vunce
Thanks, V.

Andy
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Old 22nd May 2020, 12:59 PM   #1259
xrk971 is online now xrk971  United States
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Alpha Nirvana 39w 8ohm Class A Amp
Congratulations on first sound, Andy!

My clip light flickers sometimes when I play loud, and it’s not bass kick drums that makes it light (as I guessed), but usually it’s either female vocals or piano fortissimo crescendos. My speakers are very inefficient though at 82.5dB so it can happen. But the clip is very graceful and soft as I cannot hear it - only see the light once in a while. Without the light, I would have never known it was clipping.
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Old 22nd May 2020, 11:49 PM   #1260
AKSA is offline AKSA  Australia
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And congrats from me too, Andy, and I am lucky and will visit after this virus thing in a week or too to see your beautiful creation.......

Hugh
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