Sometimes when I plug in a guitar cable this will set the amp off into making clicks and pops and such. I will also describe my current skill level in electronics to see if my best bet is to just take it to the tech.įirst off when I turn the standby switch the amp runs fine no noies/hum. Maybe if I describe my problem more it will help me out diagnosing. please link to a schematic of your exact AC30 model and we an help.īrutal! Here I thought I had sufficiently solved my problem and was definitely a genius. I think helping you ID each tubes function is a great first step to helping narrow down where the issue is. That does include removing and re-inserting tubes but all the work should be done very systematically so that you narrow down the issue. so I recommend that you maintain consistency and focus on diagnosing that problem. I think you still have quite a bit of investigating to get the problem identified. but it is never good to start thinking about regular maintenance issues while you are trouble shooting a specific problem. Link to a schematic of your particular variant of the AC30 and we can tell you what tube does what.įWIW, I think you have yet to actually diagnose your real problem and you are distracting yourself. The AC30 uses a lot of energy because it is Class A. and rectifier tubes work hard so they do wear out more often than the other tubes. There are very few well made new rectifier tubes. Preamp tubes are usually very long lived unless they are just plain badly made. the specification of farads and voltage will usually narrow down the choices of construction available for consideration. Small yellow boxes are probably polypro caps. there may have been a running revision or it may be for another markets practical (power supply) or regulatory (radio interference) requirements. It's unlikely the factory forgot it on purpose. I would caution you from assuming that just because you see a place on the circuit board with some holes and a part label that you should add the parts. Thanks for any advice, it's greatly appreciated! Does anybody know for sure what is what in there? I have a theory that v2 is the phase inverter and v1 and v3 are the tubes for each separate channel but have not verified this on the schematic. One more problem I need to solve is what tubes are what in the preamp section. The stock tubes in this amp seem to be of poor quality especially the rectifier which I've already had to replace. When I do these fixes I am planning on ordering some new preamp tubes because my guess is if the capacitor is not my problem they are. Anyone out there know for sure what I need to order? They are definitely not ceramic or electrolytic.
![vox ac30cc2 problems vox ac30cc2 problems](https://www.strat-talk.com/data/attachments/265/265166-254585747e8f2e7f3d37af62477d1b45.jpg)
I've theorized that they are metallized polypropylene film due to this picture but am not 100% sure. One problem I'm running into is that I'm not 100% sure what type of capacitor I'm missing. Obviously I need to replace these components even if that's not causing my snaps crackles and pops.
#Vox ac30cc2 problems full#
I know it's not supposed to be a bridge because the other side, c37 and r52, has a full on resistor and the schematic also says there should be a resistor there. Also I don't know why but the resistor right next to it (r51) is just a straight bridge with no resistor. Not sure if this is the cause but I noticed that capacitor c36 was missing. i decided to take a look inside and see what the problem was. basically my amp was makin a lot of unwanted noises. Well I've had my ac30cc2 for a couple months and recently I got a case of the rice krispies.