I like the Caldwell mods but feel I'd like to split the difference between those cap values and stock.
I'm also considering bumping that Top Boost cap from 68pf to 82pf while I'm in there as you suggested. I'm guessing there's a lot more contrast between the Brilliant switch being on and off now? How much darker does your normal channel sound with the 30pf instead of the 68pf? Just to make sure I understood what you wrote, you replaced the 68pf cap on the Normal Volume pot with a 30pf? And then changed the brilliant switch cap from 68pf to 150pf? I was also thinking about using a higher value cap to get some of that Brilliant switch high end back.
#Vox ac30cc2 speakers mod
I'm fairly pleased with the Top Boost mod with the 68pf cap, but as you mentioned, the Normal Channel sounds better than stock, but the Brilliant switch essentially does nothing at this point. I had my Vox AC30CC2X modded by Don Butler a few years ago, and then had a local amp tech do the additional Lyle Caldwell mods a few months ago. I was very interested to find your blog entry on this. For the modifications I am doing, I am just going to have to solder them to the visible side of the panel, seen in the picture below and be careful. I guess I'll have to desolder the switches in the future and find another way to remove them from the panel. That usually means that the switch body itself is broken internally. I actually scratched one of them up trying to turn it and noticed that the threaded part of the toggle switch was turning with it. The only issue I came across is that three of the chrome decorative threaded caps for the four toggle switches on the control panel PCB would not come off. There are four main PCBs - The power section PCB, preamp PCB, control panel PCB, and the rear panel PCB - which houses the effects loop, speaker jacks and reverb I/O. It's a very ingenious design, while it takes a bit of time to visualize where everything is, the layout of each PCB is very easy to view, and you can follow the circuit design quite simply. The rectifier, power tubes and transformers are mounted up from the power board - but the preamp board is mounted vertically, with the preamp tubes extending horizontally. Instead of all the tubes mounted up or down, the AC30 uses many different planes. Unlike other amps I've worked on, the AC30CC chassis is a little different. Página 5 While the amplifier chassis specifications are identical, different speaker options are available as follows: AC30CC1: 1x12' combo with a custom voiced VOX NeoDog speaker AC30CC2: 2x12' combo with a pair of custom designed GSH12-30 speakers which add a top end mel- lowness and smooth bass response AC30CC2X: 2x12'.
I bought the separate head + cab version for two reasons: easier to carry (the combo weighs a tonne) and also enables use of more microphonic-prone tubes due to further separation from the speakers.After removing the back wood panel, disconnecting the the reverb and speaker cable, there are four screws holding the chassis in place, then the chassis slides out. Plenty of info on that sort of stuff on the web and yes it makes an incredible difference. For a more classic AC30 sound it can be easily modified with more vintage JMI-era capacitors from Sozo and an output transformer from Mercury Magnetics. Weber do great aftermarket speakers for this amp (blue dogs and silver bells). Stock tubes are pretty average and I used the JJs instead. For me the modern version of the AC30 is a bit grating on the ears so I set about some straightforward tweaks. This is a loud gigging amp with great control over a wide range of tones (plus tremolo and reverb). With the top boost and normal channels being able to be mixed this allows very high and musical distortion or can be blended back to sweet cleans with the unique Vox voicing. I bought this amp for a band playing blues/punk/psychedelic originals. Vox AC30 cc2x Guitar Amplifier- 2x12 Alnico Blue Speakers - Combo Valve. Great Vox tone but much better if you do the recommended modifications. Find many great new & used options and get the best deals for Vox AC30CC2.
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