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Old 27th October 2017, 02:35 PM   #51
sene is offline sene  Jamaica
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Hi Hugh

Cogratulation!!!You have a beautiful family.How times changes....many years ago you sent me a pcture of the family and yourself ....The children are all grown up and have all grown up so beautiful.In the last picture i dont know who is the hit man but you both are looking good!!!!.)
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Old 29th October 2017, 09:57 PM   #52
AKSA is offline AKSA  Australia
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Thanks Sene!
I appreciate the thoughts - but what about you and your family?
I would love to see a photo one day, either here in the folder, or in email!

The younger daughter, Alessandra, has her 30th birthday just today!

Ciao,

Hugh
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Old 29th December 2017, 02:52 AM   #53
nigelwright7557 is offline nigelwright7557  United Kingdom
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I rarely bias my amp designs with more than 10mA.
Peavey tend to use low bias too.
Why waste power in the heat sinks ?
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Old 29th December 2017, 03:58 AM   #54
andyr is offline andyr  Australia
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Quote:
Originally Posted by nigelwright7557 View Post

Peavey tend to use low bias too.
And Nelson tends to use high bias.

Quote:
Originally Posted by nigelwright7557 View Post

I rarely bias my amp designs with more than 10mA.
I assume the optimum bias probably depends on the circuit configuration but, with Hugh's N80, I found the increased bias (over how Hugh sets it normally) delivered a deeper soundstage.

So a worthwhile thing.

Andy


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Old 8th February 2018, 05:41 PM   #55
Sjef is offline Sjef  Netherlands
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Originally Posted by nigelwright7557 View Post
I have found sometimes if the DC offset isn't close to zero that the amp puts out a little DC and this makes one transistor warmer than the other.
Sorry for the late reaction. Does this mean I should provide a little DC load to the amp like a 47 ohm resistor or something like that? It's the tweeter amp that's getting warmer. My tweeters are connected via a DC protection cap so the amp sees only a AC load.
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Old 9th February 2018, 07:11 AM   #56
AKSA is offline AKSA  Australia
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I find that mosfets need more quiescent to give a reasonable linearity at very low outputs. If you use a 480W mosfet, a minimum is 125mA, and on the 1040W device, I like to set them at 210mA.

Bipolar is different. An AKSA needs only 58mA for outstanding clarity, but I have not tried the very modern devices, like the TO264 MJL4281AG and MJL4302AG (both 230W, 350V, 15A, 35MHz) which purport to have beta minimum of 80 from 100mA to 7A, just the same as the C5200/A1943 I used in the AKSAs. That is impressive, actually.

Cheers,

HD
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Increasing the bias current on my NAKSA80s & Sorayas ... seems to be a good thing!!Hide this!Advertise here!
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