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So ive got this burns tri sonic pickup...


tommorichards
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  • 2 weeks later...

In a word, no.

There's nothing particularly special about the construction of Tri-Sonics, so the impedance should be in line with a (a fairly hot) strat pickup. It sounds like there's a short in the windings somewhere.

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If the main body of the coil is still in its paper / plastic wrap (I forget what, was 1975 or so when I took mine apart to look inside) then the coil should be ok. You might have a short against the metal case. Take it apart, remove the coil from the magnets (it is very simple construction if an original one). Try measuring resistance. If in the K ohm range (as mentioned above) the coil is ok. If the coil is ok when outside the case, coat the wires in something like varnish or nail varnish. This will hopefully sort it.

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Very unlucky by the sound of it, probably a short. However it can't be far in, say 6K ohms and 7500 turns for whole pickup. This gives about 1 ohm per turn. Are you brave? You might get lucky by removing say 10 turns - problem is which end to remove 5 turns from. The danger of this approach is that you may destroy it forever and it may not fix the issue. It depends on how the pickup coil was wound. It may not be possible to remove the offending wire to remove the short.

Another desperate measures method - am not sure if this will work. Polyurethane varnish (spirit based), dilute until incredibly thin. Immerse pickup coil, leave several days. Remove, allow to dry. You might get lucky and varnish gets into the 'short'.

Good luck

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[quote name='BigRedX' timestamp='1362236360' post='1997374']
It could just as easily be on the inside 10 turns.
[/quote]

Agree, that what was I was trying to say with which end to remove turns from. You said it more clearly - inside or outside windings.

Ask the guy can he rewind without original coil - he will have some originals to work from. If he has, you now have nothing to lose and £20 to gain (other than time, faff and possibly varnish everywhere). If he can rewind try the DIY first. Nothing to lose, beer money to save...

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