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RE: It might be ...

I removed some carbon comp grid stoppers from the 6SN7 driver stage relay sockets on my breadboard.

My ARTA test setup uses a 100K pot to trim voltage coming out of the sound card. It is housed in a plastic box with rca jacks for in/out.

For some reason, I am getting odd THD readings from on the left channel, so I think the grid might be going into oscillation as I turn the pot.

A test signal directly from the soundcard into the amp causes no problems.

I will have to investigate further and try to input cap mod again.


DT 667

Edit : found an issue related to power supply returns.

Once corrected, ARTA measurements seemed to normalize.

I will need to re-test the input cap mod again.





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  • RE: It might be ... - deathtube 667 04/1/2102:51:42 04/1/21 (0)

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