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What kind of tube is in the 583 & 983?

The 583 and 983 are the same preamplifier and use one 12AX7 per channel.

TIP: When selecting different tubes for different sounds, use the -20 pad technique mentioned earlier. Engaging the pad and using Input gain to compensate will feature the 12AX7’s character and allow you to hear the differences between tubes much more than if the input transformer was part of the signal.

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