Old large advent speaker

The best way is new 16uF 50V tweeter capacitors. There are actually two of them in each speaker.
Use bipolar electrolytics, or polypropylene film types which will be larger in size but better.
Solen 16uF 400V Polypropylene Capacitor

Check the value of the 3 ohm resistors, you may need new ones. If you can't measure, just replace them.
If possible, clean the switch contacts.
 

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I suggest you reach out to Danny Ritchie of GR Research. He has a forum on Audiocircle. He is well known for modding and improving crossovers in many speakers, vintage and otherwise. Given the popularity of that speaker, he may already know what to do.
 
my advent speaker

Dear y'all,
since Igot time yesterday to check the continuity of the circuit. I found out that one coil is not working (burned) since the cabinet is open I can find any exact value of all the inductors. can someone lite me up or give me the nearest value of the following inductors.
1.6mh 28ohms
0.65mh 30ohms
my caps are 16uf,8uf
and one 3 ohms resistor.
I check parts express they got 1.5 air core only

Thanks,
Ann