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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Fet nine, 10 differences?
Fet nine, 10 differences?
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Old 30th September 2010, 07:52 PM   #1
treuben is offline treuben  Australia
diyAudio Member
Join Date: Jul 2006
Default Fet nine, 10 differences?

Hello all, I have been able to find a fair bit online about the Threshold fet 10 topology and have been fortunate enough to have one on loan for a while and have loved the way it sounded. To me just the right amount of color and no excess of anything much. Bass was nice and tight also. I have some big electrostat/transmission line hybrids and, while old, they please me no end.

Anyhow - If anyone might help that has the knowledge - Can someone tell me the similarity (if any) or difference between the fet nine line section and the fet 10? Are they similar at all? Also I have seen one person saying the only difference from HL to HL/e or He is a change to zener ccs on line boards and bigger psu and cosmetics. Is this correct? Thank you to all you chaps that post (and also to the venerable Mr Pass for whom I have the greatest respect as designer and human being). Kind regards, Trevor in Australia.
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Old 1st October 2010, 05:18 AM   #2
treuben is offline treuben  Australia
diyAudio Member
Join Date: Jul 2006
I have also heard now that the fet 10 HL is capacitively coupled at output and He has dc servo. Is the HL/e and He the same? I am confused now!
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Old 22nd August 2012, 11:29 AM   #3
treuben is offline treuben  Australia
diyAudio Member
Join Date: Jul 2006
Default Does anyone know about these that can help?

If you know if there is a difference and what it amounts to in the line stages of these, could you answer this possibly please?

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