Speaker Works: SI T amp doesn't work with soundcard

bcherry · 25th February 2006, 10:48 PM

An otherwise healthy SI T amp doesn't get along with the Soundmax soundcard in my Dell. Once in circuit with the Wallin jig, it emits a 'ticking' beat irrespective of volume setting. No signal throughput. A tube amp in the same setup works fine (I'm surrounded by tube amps and only have this one SS amp). Anyone have any ideas why the soundcard and T amp won't talk to each other?
Brian

dwk123 · 26th February 2006, 06:36 PM

Probably because the T-amp is a full-bridge output, and the Wallin jig ties one side to ground/common. The digital/switching amps are not good choices to use for this type of measurement app for that reason - the two outputs need to be isolated from the signal ground. You can do it with cap coupling, but then you're introducing a high-pass which you have to be careful about.

bcherry · 27th February 2006, 04:23 AM

Thanks for the reply.
I've also tried an otherwise quiet p-p tube amp that hums when connected through the Wallin jig.
What amps are Wallin jig users, using?

Brian

25th February 2006, 10:48 PM	#1
bcherry diyAudio Member Join Date: Mar 2002 Location: Hong Kong	Speaker Works: SI T amp doesn't work with soundcard An otherwise healthy SI T amp doesn't get along with the Soundmax soundcard in my Dell. Once in circuit with the Wallin jig, it emits a 'ticking' beat irrespective of volume setting. No signal throughput. A tube amp in the same setup works fine (I'm surrounded by tube amps and only have this one SS amp). Anyone have any ideas why the soundcard and T amp won't talk to each other? Brian __________________ Disclaimer: I may or may not offer for sale items mentioned in this thread, and if I do, I may or may not make a profit.

27th February 2006, 04:23 AM	#3
bcherry diyAudio Member Join Date: Mar 2002 Location: Hong Kong	So that's what a digital ground loop sounds like. Thanks for the reply. I've also tried an otherwise quiet p-p tube amp that hums when connected through the Wallin jig. What amps are Wallin jig users, using? Brian __________________ Disclaimer: I may or may not offer for sale items mentioned in this thread, and if I do, I may or may not make a profit.

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26th February 2006, 06:36 PM	#2
dwk123 diyAudio Member Join Date: Feb 2002	Probably because the T-amp is a full-bridge output, and the Wallin jig ties one side to ground/common. The digital/switching amps are not good choices to use for this type of measurement app for that reason - the two outputs need to be isolated from the signal ground. You can do it with cap coupling, but then you're introducing a high-pass which you have to be careful about.

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