fyi: many, many spring reverbs suffer from noise/hum. They are VERY
susceptible to it. I don't have an a-199, but my orban spring hums if it's
in my rack but doesn't if it's elsewhere away from other things.
so this noise is most likely a problem with most spring 'verbs, I think the
Accuverb from accutronics claimed to shield from this.
best,
phil

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cloaca recordings
http://www.cloaca.net/