Need to restring the old Epi. Forty-five years old and going strong. I keep her out and handy so she gets a lot of acoustic playing time. It has a single pickup, but also "f" holes so she can be played like and acoustic. Last year I had a luthier bring her back to life. He strung it. Time for some new strings. Do I get acoustic or electric. I believe she has a set of Ernie Balls on it now.

If the guitar had a piezo pickup it wouldn't matter too much,I don't think so anyway but single coils,P 90s or humbuckers definitely perform better with steel electric strings.Bronze,Phosphur-bronze etc. for acoustic guitars don't have near the magnet response as ferrous metals and are therefore not suitable.

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'65 Strat,65 Mustang,65 Jaguar,4 more Strats,3 vintage Vox guitars,5 Vox amps,'69 Bassman with a '68 2-15 Bassman cab,36 guitars total-15asst'd amps total,2 vintage '60s Hammond organs & a myriad of effects-with a few rare vintage ones.

I believe DR (I think that's who does it....) makes a bronze/nickel wrapped string specifically for acoustic/electrics. Maybe others do as well (? Fender?)........
I don't own an ac/elec so, I have no experience with them.....
YMMV

I play a Fender Telecoustic Deluxe which has a Tele pup AND a Fishman and both can be blended with a slider so I have had this predicament recently too. I finally settled on D'Adarrio 10 Bronze acoustic strings but I don't use the wound G. I use an Ernie Ball 17 for the 3rd string.

Saying that I usually am playing it through an acoustic amp and very rarely use the Tele pup on its own.

Best of luck.

CC

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Fender Stratocaster (parts build)
Fender Telecaster 72 Custom RI
Fender Telecoustic Deluxe
Gretsch Electromatic Pro-Jet
Gibson Les Paul Standard Plus
Gibson ES-135
Zenith Type-17
Marshall 70's JMP Superbass 100w
Blackstar HT-5

Are the bridge saddles adjustable for intonation? If not, that will tell you whether is was designed for a wound G or not. A wound G would have the saddle up forward similar to the high E. A non-wound would be back further than the B.