OTL Asylum OTL, Output Transformerless Amplifier User Group.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ OTL Asylum ]

---

[ Alert Moderator ]

---

Re: hypothesis

Posted by Morgan L (A) on March 11, 2002 at 10:27:30

In Reply to: Re: hypothesis posted by Paul Speltz on March 10, 2002 at 15:11:40:

Thanks for sharing that experiment/experience. It is very similar to what
I hear.
Another thing I would like to try (as in this case there IS an
alternative to using Zeros!) is to wire the 4 drivers in my bass line-array
in series (for 32 ohms), but that will have to wait until I finish my OTLs,
since my sand amps can only put out about 20Vrms (and there is in addition
some active bass boost involved!) - those 12 watts or so just wouldn't cut
it (sensitivity would drop from currently 94 to 88 dB/2.83V - efficiency
would of course remain the same).
I furthermore appreciate the fact that the Zeros serve as an extra 'DC
servo' for my ribbons, which are otherwise very sensitive even to mV drifts
on the power amp outputs. So it's goodbye cap-coupling, too!
(I'm willing to run that risk...)
Lastly, there was a discussion below on grounding the CT of the Zeros.
You said that only the balanced taps should be used if the CT is grounded.
My understanding of autoformers/chokes is admittedly lacking, but I don't
see the problem, as the loudspeaker 'floats' relative to ground no matter
where it is connected. Was the concern just related to a grid current
condition (which I won't have), or more general?

Cheers,
Morgan

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---