Regarde ici, il explique comment rénover un Vox AC 30 1970's.
Vox AC30 Late 1970
Pour ton problème de son le potentiomètre doit être hS.
Nettoies bien les potars comme indiqué sur le site
Ligne 2(bombe "spécials contacts électronique type K2" j'en utilise pour mon travail).
Détails du travail effectué sur son ampli :
I had to change many dead and tired components, as I’m sure you can see in the photo. Amongst all the listed faults were: poor sound, very noisy, no tone, vibrato not working, noisy potentiometers, keeps blowing power fuses (even a 10 amp fuse! I’m not surprised as the GZ34 rectifier tube was faulty here), speakers need a rewire…..the list goes on! After all the electrical component changes, a clean and spray of all the pots, plus replacing a couple of them, a new GZ34, one ECC82, a full set of JJ EL84’s, correct 3 amp power fuse,............... In-fact, here is the original invoice list, which makes describing the work required much easier:
To Repairs/Service On Vox AC30 70’s Reissue Combo:
1. Removal of main circuit board for many component changes and servicing of most of below.
2. Spray & clean all potentiometers (replace two) & valve bases.
3. Supply 1 x matched quad set of premium JJ EL84 output tubes.
4. Supply 1 x JJ GZ34 rectifier tube. This was the cause of the blowing fuses!
5. Supply 1 x Mullard ECC82 tube (on tremolo circuit).
6. Replace many components in the form of resistors/capacitors (please see returns bag).
7. All nuts, bolts, screws, washers, hardware checked & replaced as need be. This includes the tightening of the handles, baffle, input sockets, power switch, all controls, corner brackets and the feet. Also replaced the two missing feet and changed the rusty screws on the remaining pair. All new backs’ screws and cup washers + correct M5 cage nuts. Correct spacer washers now on amp under main wooden board, plus correct Allen bolts/penny washers too. Many were missing!
8. Rewired mains (power) cable and fixed proper anchorage to chassis, removed taped-up junk.
9. Cleaned and straightened main control panel as best as possible.
10. Hovered and cleaned inside of case.
11. Fitted correct 3 amp power fuse.
12. Replaced full set of “black chicken head” knobs. (many were cracked or broken).
13. Rewired speakers with correct cable as requested.
14. Both speakers found to be faulty, replaced both of these (supplied) also with missing plain washers.
15. Re-soldered all four output tube bases (very dry!!).
16. Traced and sorted “non working tremolo” One of the tremolo switches had been changed and wired incorrect!!?....the tremolo would never have worked wired in this fashion!
17. Replaced worn out “grub screws” in speaker connecting block!!?
18. Supplied and fitted tremolo foot switch “flying lead” in-line jack socket.
19. Supplied missing tremolo foot switch.
20. Approximately one and a half full days work, including collection/pick-up (fuel) of knobs and power-tubes from Snenton, Nottingham.
Tu trouveras des potars en rechange dans un magasin d'électronique ou sur les sites de vente internet (Radio Spares par exemple)
Tiens j'ai trouvé un autre Ampli JMI 1962 VOX AC30 avec a liste des réparations effectuées
Vox AC30 JMI 1962
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