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FET3 PREAMP ON 12 STRING MODEL 1755

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Mantaray
Posted 2023-02-16 6:03 AM (#558049)
Subject: FET3 PREAMP ON 12 STRING MODEL 1755


Joined:
February 2023
Posts: 4

Location: Brisbane Australia
Gooday from down under. I have a Model 1755 '93 vintage. Had it since new. The FET3 preamp seems to have died. Is it possible to get them repaired, or if not is there an after-market preamp that will slot in. Mine has the separate 9V battery box adjacent to the FET3. I can see the OP24 looks like it would fit but can't find either of them for sale. Any feedback appreciated.
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tpa
Posted 2023-02-18 1:22 PM (#558050 - in reply to #558049)
Subject: Re: FET3 PREAMP ON 12 STRING MODEL 1755


Joined:
December 2004
Posts: 566

Location: Denmark
Hi and welcome. It is not just a broken battery lead?

Here is an old thread discussing some differences but it does not explain if the OP24 fits as direct FET3 replacement. The FET3 seems also rather basic - meaning that it probably is easier to troubleshoot/repair for someone with basic knowledge of analog electronics.

http://ovationfanclub.com/megabbs/forums/thread-view.asp?tid=8313

Edited by tpa 2023-02-18 1:30 PM
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Mantaray
Posted 2023-02-18 5:28 PM (#558053 - in reply to #558050)
Subject: Re: FET3 PREAMP ON 12 STRING MODEL 1755


Joined:
February 2023
Posts: 4

Location: Brisbane Australia
thanks for the feedback. As an ex Australian Navy electronics tech I'll have a crack at it..
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tpa
Posted 2023-02-19 3:04 PM (#558055 - in reply to #558049)
Subject: Re: FET3 PREAMP ON 12 STRING MODEL 1755


Joined:
December 2004
Posts: 566

Location: Denmark
Then you probably may find some interest in this: http://www.ovationtribute.com/Ovation%20Schematics/Ovation_FET-3_Pr...

The diagram is availble from ovationtribute.com is also http://www.ovationtribute.com/Schematics.html There is also a mechanics parts list where seemingly many mechanical parts between FET3 and OP24 were common so chances are that the OP24 may fit.

BUT - BUT - BUT !! The OP24 also came as OP24+ which has different geometry. See them here: http://www.ovationtribute.com/Pr%E9-amplis/Ovation%20Preamps.html

- Share your findings and doings for the joy and benefit of us all, please :-)

Edited by tpa 2023-02-19 3:23 PM
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Patch
Posted 2023-02-24 8:08 AM (#558072 - in reply to #558049)
Subject: RE: FET3 PREAMP ON 12 STRING MODEL 1755



Joined:
May 2006
Posts: 4226

Location: Steeler Nation, Hudson Valley Contingent

Or you could do it the hard way, like I did.

Replacing a FET-3 in my 1755 Custom Balladeer

(On second thought ... Don't do it the way I did. There's almost always a better way do do things than the ways I pick. )

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