New SI T-Amp, Different internals

schmalex · 8th March 2007, 05:54 PM

I got my amp about two weeks ago. I'm quite pleased with the sound. I just took it apart this morning and discovered a few differences. For one, the PCB on the pot has different printing on the top. The circuit seems to be the same configuration. The biggest mystery are these two metal donut shaped pieces. The speaker wire connections out of the main PCB are wrapped around them twice, then soldered to the terminals. They are glued on to the chassis, on the outer wall of the battery case. From what I can tell, looking at other pictures of dissassembld t-amps (TNT audio and the T-amp gallery) these must be new. Anyone know anything?

Fenris · 8th March 2007, 05:59 PM

They're ferrite beads to reduce RF emission. Many class-D datasheets recommend them.

schmalex · 8th March 2007, 06:12 PM

Why were these not included in the earlier versions? When did they show up? And finally, should I incorporate them into my rebox? I haven't read about problems with RF interference.

Thanks for the answer.

Pano · 9th March 2007, 12:09 AM

Those are some hefty ferrites. Bigger than the output inductors!

There are most likely there to reduce RFI.

EdT · 9th March 2007, 12:50 AM

Proberly a CE requirement if they want to be shipped to the UK.

schmalex · 10th March 2007, 05:13 AM

So, when I rebox it, should I incorporate the ferrite rings? Has anyone had trouble with RF?

8th March 2007, 05:59 PM	#2
Fenris diyAudio Member Join Date: Jun 2004 Location: The last frontier	They're ferrite beads to reduce RF emission. Many class-D datasheets recommend them. __________________ Listen to the music through the stereo, not the stereo through the music.

9th March 2007, 12:09 AM	#4
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Those are some hefty ferrites. Bigger than the output inductors! There are most likely there to reduce RFI. __________________ Take the Speaker Voltage Test!

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8th March 2007, 06:12 PM	#3
schmalex diyAudio Member Join Date: May 2005 Location: Seattle, WA, USa	Why were these not included in the earlier versions? When did they show up? And finally, should I incorporate them into my rebox? I haven't read about problems with RF interference. Thanks for the answer.

9th March 2007, 12:50 AM	#5
EdT diyAudio Member Join Date: Dec 2006	Proberly a CE requirement if they want to be shipped to the UK.

10th March 2007, 05:13 AM	#6
schmalex diyAudio Member Join Date: May 2005 Location: Seattle, WA, USa	So, when I rebox it, should I incorporate the ferrite rings? Has anyone had trouble with RF?

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