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 View Post: DIY Workshop » New Cavalli Kumisa III plus Boards
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runeight


Headphone Council

Joined: Mar. 8, 2002
Locale: Austin, Texas
Total Posts: 1879

posted 11-03-2006 09:56 AM CST (US)   View Profile for runeight   Send PM  to runeight   |  Edit Message  |  Quote Message in Reply

[Quoting Steinchen]

count me in!

At what bias level is the output stage intended to be set ? Since the output transistors do not need heat-sinking I assume something like 20mA or 25mA ? (though I'll heatsink them anyway and try levels of around 50mA <big grin> )


The bias point is intended to be 30-40mA, but with the bias resistors as shown you can set it from about 15ma to 60mA. If you reduce the fixed bias resistor to 2k instead of 2k2 you can get to Benny's original 70mA, but dbel84 didn't really need to get that high to get good performance.

If you run at more than 50mA idle per channel you might consider increasing the VA of the transformer. A 400mA secondary would be better.

[Edited by runeight on 11-03-2006 at 09:19 AM.]

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