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Re: Help with Atma-sphere MP3 and DC offset

Manuel,

If the DC lights are coming on, it's due to a section mis-match within the tube. The MP-3 likes to see closely matched sections, but it doesn't care if the two output tubes are not well matched.

The VT-231 is not a direct 6SN7 replacement, so it might be that the DC servo on the MP-3 doesn't have enough range to manage this tube. It might also be that the sections are just very badly matched.

We ship the MP-3 with the common Chinese 6SN7. Out of every hundred or so of these, I come across one or two that won't zero out in an MP-3, so it's pretty rare.

I'd test those VT-231 on a good tester, and see if they are truly section-matched as well as you were told they are.

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