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Old 15th November 2013, 10:40 AM   #671
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Default Circuit

Circuit ... try again ...
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Old 15th November 2013, 01:35 PM   #672
stajo is offline stajo  Sweden
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Nice IP. On a 1660 with primarys in series I might even try UL.
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Old 16th November 2013, 01:24 AM   #673
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I'm still using the 4P1L triode strapped to run my horns. Battery bias, single 6SN7 input with LED bias. Nothing changed at all. I'm happy.
http://www.diyaudio.com/forums/showthread.php?p=3400631
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Old 16th November 2013, 03:03 AM   #674
tcqanh is offline tcqanh  Viet Nam
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Here is my favorite amp, very simple, easy to build, quite cheap, output ~ 3W, deadly quiet with noise 0.6-0.8mV. Sound is so sweet and It beats my 300B on midrange
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Old 16th November 2013, 04:21 PM   #675
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Could you clarify the impedences on the primary of the output transformer? Is it
3.5k on each primary or 1.75k adding up to 3.5k? I haven't seen separate coils
used to achieve what looks to be an ultralinear setup. Very interesting,

Thanks for posting this,

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Old 17th November 2013, 01:33 PM   #676
tcqanh is offline tcqanh  Viet Nam
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These opt are diy product from a friend. Plate and g2 winding are the same turns and have same 3.5K impedance. I guess it operates like something between triode and ultralinear, so I can get more power than one in triode.
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Old 17th November 2013, 06:42 PM   #677
Pano is offline Pano  United States
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Interesting. It looks like one winding of the primary is simply acting as a feedback loop.
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Old 17th November 2013, 06:52 PM   #678
stajo is offline stajo  Sweden
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Quote:
Originally Posted by Pano View Post
Interesting. It looks like one winding of the primary is simply acting as a feedback loop.
Feedback? Its a normal 50 percent between pentode and triode to me. Ultra linear concept. Evolve plz

Edit. I see now, its on G2. Sorry. Yes please?

Last edited by stajo; 17th November 2013 at 06:55 PM.
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Old 17th November 2013, 06:55 PM   #679
Pano is offline Pano  United States
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Yes, and that's a form of feedback, right? Ultra-linear is usually at 43% tap, that's all.
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Old 17th November 2013, 07:01 PM   #680
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Quote:
Originally Posted by stajo View Post
Feedback? Its a normal 50 percent between pentode and triode to me. Ultra linear concept. Evolve plz

Edit. I see now, its on G2. Sorry. Yes please?
If two windings were in series and its center point were connected to G2 it could be UL, but they are in parallel.
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