![]() ![]() Do a quick google search " Ac15C1 tube rattle forums." Sending Vox an email to send me a free AC30 as we speak.jk but yeah atleast some swag and or something. The Cylinder actually intensifies and amplifies microphonics.Īfter removing it.finally no more tube rattle. ![]() Even the ones at the store do this when fully cranked after testing some today at GC. ![]() This thing causes the tube in V1 to give a hum and rattle when hitting the A D and G strings.but especially the A string.making it imposible to play comfortably. Me and my father appeared to have discovered the issue that plaugues thousands of sold and unsold and even Vox amps being made at the factory to this day. ![]() Not falling apart but the evr so slight looseness attributed to unwanted sypathetic vibrations. The amp is great but this is a problem in every AC15.I thought I could solve it with a simple tube change but the issue goes much further than that.Ĭhanging tubes solved the issue for about a minute and then the tube rattle continues.Īt some point a minor rattle occured because the amp chassis needed to be tightened to the cab a bit tighter. The main one being the microphonics in V1.its always microphonic and the only one no matter what tube you use.GE, JJ, s a plauge. I have kept on finding some issues with the my recent purchase and have encountere two issues. I have concluded that all AC15C1 and possibly AC30C2s have manufacturer flaw of tube rattle from lack of oversight at R and D due to the Cylender retainer. Holding the tube in place while someone else hits a chord.removing and placing back the tube retainer. And all the other tubes on the unit have the wire clip retainer including the power tubes.Īfter much testing.off taking the back panel off and on. Namely a loose cab screwed to cab and most importantly microphonics.Įvery Vox amp made in production for the past 7 years has one of these cylinder retainersin V1 as a tube retainer to avoid microphonics. Its a great amp but.have had issues with it. Went through Blues Jr, Blues Deluxe, Deluxe Reverb, AC30 but felt at home with the Ac15C1. I just bought a new AC15 because I was in the market for a new amp and felt it was the best for me and my style. I am not sure if I quite understand how this bridge rectifier is working.This is my first post and have been seeing from the benches until now. They are sometimes warm to the touch but sometimes not. V5 EL84 is measuring 5.4V AC between pins 4 and 5Īm I just crazy or should I be measuring these heater voltages differently? The power tubes heaters light up but it seems the preamps are not. V4 EL84 is measuring 0.4V AC between pins 4 and 5 V1,2,3 when I measure on AC I am getting 0.08V on pins 4 and 5 to 9, however when the amp was first turned on it was jumping around from 0.03 to 4.5V The Heater voltages!!! When measuring from pins 4/5 to pin9 I am getting some weird readings Low Plate Voltage on V2, when I swapped in a Tung-sol the voltages jumped up to 150V on pin1 and 190V on pin6 Kathode voltage (pin3) on the EL84's, other voltage charts I looked at had 11.4-15V and mine is holding steady at 4V Low Plate voltage on the EL84's, I have substituted other good pairs with minimal difference. I am concerned about a few things going on: I have a Vox AC15C1 Chinese made combo on my bench that I need some help with. ![]()
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