Need info for a Bounty Hunter 840

I just read on another thread about someone who had a Bounty Hunter 840 metal detector that the sound continued and the meter needle was 'pegged'.  I have this same problem.  Does anyone know anybody who can properly repair this detector at a reasonable price?  I have in the past few years talked to a couple of people who said that they could repair it; but with little or no guarantee.  I used this detector during the early '80s a lot.  I really loved it.  When it went 'haywire', I bought a Bounty Hunter Tracker 2-D/707.  I don't care that much for the Tracker.  I was so used to the 840 that I would really like to have it working again.  Because of job and family health issues, I haven't used a detector much since about 1983 or 84 (?).  I have about  600 coins that I kept that I found with the 840 (wheat cents, pre 1950 nickels, silver dimes, and silver quarters.)  I have found dimes over 4 inches deep with it using headphones.
On the other thread, an email address was posted in 2010, about someone who had a manual for the 840; but I always got a 'failure of delivery' notice each time (2) times that I tried to send an email.  I would greatly appreciate any help that anyone can give me.  

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http://www.thunting.com/smf/index.php/topic,48269.msg263726.html#msg263726

I can't get the link to come up.  No, if I can't get the 840 repaired properly, I'll just have to get used to the Bounty Hunter 2-D.  I'm an 'old-timer' and don't like change.  Just give me my old one!           Thanks for the help, I do appreciate it.

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http://www.thunting.com/smf/index.php/topic,48269.msg263729.html#msg263729

Keith Wills at east texas metal detectors  903-734-7773  in Gilmer texas.  or Broken detectors.com  he works on everything  will cost about 85$ or there abouts if not too many new parts.

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http://www.thunting.com/smf/index.php/topic,48269.msg263734.html#msg263734

WHOA!!  Must be the old age!  I didn't realize that I didn't tell what the detector was doing.  When I turn it on and set the adjustments, I only get a few seconds before the sound goes high and the needle pegs. 
I don't know how much detecting I will be doing.  I am 71 and have COPD.  I can walk, do yard work, etc. IF I am really slow and relaxed at it.  That makes detecting sound like a lot of fun and get some exercise at the same time.  As I said, I really loved this old detector and THINK I will remember most of the set up when/if I get it fixed.  I don't really like the newer types of detectors.  A friend had a Bounty Hunter Red Baron.  I tried it a few times; but didn't like it.  I have the Tracker 2-D, but don't really like it either.  I'd rather have the old 840.  Yes, if someone knows something to look for that might cause this problem, I would really be appreciative and very excited.  I have a little experience with volt/ohm meters, etc.  I haven't taken it apart (yet); hadn't even thought about it until the last few days. 
Thanks to everyone for the comments. 

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http://www.thunting.com/smf/index.php/topic,48269.msg263787.html#msg263787

seldom, thanks for the website address.  I'll call them next week!

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