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27th October 2011, 09:24 PM
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#1 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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Push Pull Class A
How does one go about setting an amp up to run in class A. I am bad with load lines for power tubes so if someone can get me started that would be great.
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27th October 2011, 09:34 PM
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#2 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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Lets use 6L6GB:
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27th October 2011, 09:43 PM
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#3 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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For OT lets use 4k CT and aiming for about 35watts, 17.5w per tube
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27th October 2011, 09:47 PM
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#4 |
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diyAudio Member
Join Date: May 2007
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Lynn Olson made a couple of Class A DHT push pull amps, they were however 15 watt. However the information he provides will be very useful to you:
The Amity, Raven, and Aurora |
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27th October 2011, 09:54 PM
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#5 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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half of 4k ct is 2k, 400 plate volts so the math would be:
400/2000=.2 amps |
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27th October 2011, 10:02 PM
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#6 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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oops wrong graph Here we go:
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27th October 2011, 10:03 PM
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#7 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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I am on the right track?
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27th October 2011, 10:36 PM
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#8 |
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diyAudio Member
Join Date: Dec 2010
Location: Amesbury, MA
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how do i get the curve or "knee" for plate dissipation on the graph?
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27th October 2011, 10:43 PM
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#9 | |
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diyAudio Member
Join Date: Apr 2009
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Quote:
Halve the 4k primary related to the secondary is not 2k but 1k. I guess you know that the general rule for class A is that both tubes conduct during the full cycle. |
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27th October 2011, 11:04 PM
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#10 |
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diyAudio Member
Join Date: Apr 2009
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