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10-20-2009, 06:18 AM
| #1 |
| Senior Member Join Date: May 2007 Location: Silicon Valley ; USA
Posts: 452
| Choke tail phase inverter
Just wondering if anyone has ever built a choke tail phase inverter. -g
__________________ ______________________________________ Gary Moore Moore Amplifiication mooreamps@hotmail.com |
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10-20-2009, 04:57 PM
| #2 |
| Senior Member Join Date: Feb 2009
Posts: 109
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Well, that guy at Boozhound labs has. (Google) I think he also has some sound clips.
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10-20-2009, 05:13 PM
| #3 |
| Senior Member Join Date: May 2007 Location: Silicon Valley ; USA
Posts: 452
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Ya, I saw that. I'm still thinking of using a pair of 12SJ7 for that purpose, instead of a triode. -g
__________________ ______________________________________ Gary Moore Moore Amplifiication mooreamps@hotmail.com |
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10-20-2009, 05:27 PM
| #4 |
| Senior Member Join Date: Feb 2009
Posts: 109
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Wouldn't using pentodes defeat the purpose of the choke tail? I.e. creating a lower impedance drive source / running the PI at a higher current to minimize bias shift/hard grid clipping?
Last edited by octal; 10-20-2009 at 05:27 PM. Reason: typo |
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10-20-2009, 07:11 PM
| #5 |
| Supporting Member Join Date: Jul 2007 Location: So. Calif.
Posts: 186
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I've never seen an PI with a choke tail. There was an article in Glass Audio with CCS chip in a Super Reverb. Seems more like a hi-fi type thing though.
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10-20-2009, 07:37 PM
| #6 |
| Senior Member  Join Date: Oct 2007 Location: Tucson, AZ
Posts: 430
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...the "tail" resistor functions as a quasi-constant current source, thus serves more as a biasing device. ...substituting a choke for the resistor simply reduces voltage-drop (drastically) and provides a current-sensitive AC-reactance (unlike simple DC-resistance).
__________________ ...and the Devil said: "...yes, but it's a DRY heat!" Last edited by Old Tele man; 10-20-2009 at 10:48 PM. Reason: replaced reactance (XL) with impedance (Z) |
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10-20-2009, 09:09 PM
| #7 | |
| Senior Member Join Date: May 2007 Location: Silicon Valley ; USA
Posts: 452
| Quote:
-g
__________________ ______________________________________ Gary Moore Moore Amplifiication mooreamps@hotmail.com Last edited by mooreamps; 10-20-2009 at 09:10 PM. Reason: content | |
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