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Technical and scientific discussion of amps, cables and other topics.

Cascoded triodes (12AT7)

are used as the phono input stage in Atma-Sphere preamps for low-ouput mc cartridges. Experimenters have found better results by using Jensen step-up transformers and jumpering out the cascodes. Both noise and distortion are reportedly reduced. I haven't done this myself, so I'm only repeating what I've seen.


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