Ibanez 2351 goldtop feedback problem

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Author Message   Jade Username: Jade Registered: 12-2007 Posted on Monday, December 03, 2007 - 3:10 am:    Hi all!My first post is an help request for a weird problem about a les paul copy made in 1978. I haven't got pictures or S/N here with me, if it can help I'll put infos later.. The problem is that I constantly got feedbacks from this guitar. Not the classic larsen effect but just uncontrolled feedbacks, something like if the valves of the amp are gone and microphonic. (obviously the amp has no problems!) I get the feedbacks even with strings muted with both hands and no string vibrating!!!! The problem gets worse with higher gain levels.. The previous owner of the guitar tried to fill the holes in the body with polyurethane to correct this problem, he probably was thinking that the feedback was given by the partially hollow body..no comment to this operation.I'll try to remove how much polyurethane as I can. The pickups are super 70s..I hope that it isn't due to the pups because I love the way they sound.. :/ I'll try as soon as possible to replace a pickup to be sure that isn't due to the super 70s, but I hope it's a problem regarding the pots or the capacitors. Any suggestions?!?Anyone had the same problem?! I'm new to vintage earlier than 1985..hope that someone can help. Thanks ;)   Flatbag Username: Flatbag Registered: 9-2004 Posted on Monday, December 03, 2007 - 4:50 am:    Hey Jade, welcome to ICW! Super 70s in my experience are notorious for microphonic feedback. For the record chambers cause a howling type feedback, microphonic pickups cause high pithed squealing. If it's the pickups, don't despair, they can be rectified by wax potting. There's heaps of info about wax potting on the net so just hit google, check a few of the hits and combine the info - I'm pretty sure stewmac have a decent guide too. All you need is a pot, a large parrafin wax candle (the big fat church candles in junk shops will do) and a thermometer. Basically you need to need to heat the wax in a pot and submerge the pickups (do them one at a time) in the wax for a few minutes until air bubbles stop coming out. Just like drowning someone I guess, except without the struggling and splashing. I can't remember the optimal temperature, but you need to be careful that you don't get it too hot or you'll melt the bobbins (use a probe type cooking thermometer to check the temp). It's also advisable to not use a gas stove or any other type of naked flame as wax is flammable - however if care is taken not to spill the wax then flame is okay, I did mine this way. Electric deep fryers are an option if you have an old one you're looking to replace. I think it took me about an hour to pot 9 pickups, with no previous experience, I didn't destroy any of them and they all operate at high volume and gain without the squeal now (potted them about 2 years ago and still going strong).

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