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I used to have a Tangle wood ES175 copy - that had similar resonance/feedback issues, eased a tad by a replacement rosewood compensated jazz bridge.
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If you have another guitar, does the amp do the same thing with that, or if you have another amp does this guitar do the same with that amp?
Doesn't do it with other (archtop) guitars.
Not tried it on another amp yet, PRRI would be most likely, or AER 60 perhaps
Going to try a different amp/guitar position (amp behind neck, rather than body).
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I agree with @crunchman about microphonic valves, if it's a high pitched squeal, though could be the pickup as well.
Does it build after you set the string vibrating? or is it immediate? is it clearly a d - e note you're getting?
All my archtops do this to a greater or lesser degree; the position / note varies but they all have a "sweet" spot somewhere. Aware of where it happens and appropriate damping is the only real cure I've found.
Builds after any vibration and clearly limited to d-e on 5th string
Never happens on my Sadowsky Jim Hall Special (or my LeVoi Maccaferri via AER60)
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Clip on tuner or Capo - If it is a resonance issue it may help, but sometimes just moves it to a different area.
Other things to rule out are internal damage such as a loose part - worse case is a loose brace etc.
Its really hard to be specific without seeing the guitar
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various suggestions are based on volume you play and proximity to the amp - many old jazz players used very small amps then house pa to amplify accordingly for gigs to avoid this- and even early days of Scotty Moore with Elvis and they only used small amps - you can 'stuff' the body with foam, but I'm not sure how much that will diminish it, but worth a try - I've known players try a piece of pine dowel cut accordingly that is 'wedged' between the top/bottom of the body - like a sound post on a violin - to minimise vibration of teh top - maybe cuts back on the guitars natural acoustic voice but can help the amplified voice - Both 'cheap' options so try them out
Going to try harder packing under the floating pickup - felt pads like you put on chair legs when they're on hard floors to cut the noise, and dropping the scratchplate a tad to anchor the other end of the p/u (there's a lug for that).
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see if this helps a bit - http://www.jazzguitar.be/forum/everything-else/54976-archtop-feedback-how-do-you-deal.html