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http://www.guitarpug.com/2008/06/vox-ac15cc-mod-guide/
I've done the boost knob bright cap removal, which removed some spike-cicles in HF reponses. [whew], pretty easy pull with curvenose pliers, once I loosened the pot'board.
Then I moved down to this one:
Tone Cut Mod
The AC15CC does not come with a tone cut control installed. Instead, it has a fixed value resistor which is set at 220K. This value simulates the tone cut control set at ‘no cut’ so the maximum amount of top end is allowed through. In my opinion, a Top Boost circuit needs a tone cut control to help tame the top end. You can install a pot so that you have a full tone cut control like an AC30. I have dropped the value of the tone cut resistor to 180K, which simulates the tone cut control set at about 10-11 0′clock, roughly. I find that with this setting and the tone knob on my guitar, I can keep the top end in check.
To perform this mod you need to follow the ‘Accessing the PCB Board’ guide above, as you need to access the main PCB board. Locate the resistor R23, circled in diagram below, and remove it. Replace it with the new resistor value of 180K, or lower if you desire. I used a carbon film 1 watt resistor here. If you decide to use a pot instead, solder the wires from the pot here in place of a resistor. As the reverb on this amp is quite woeful, removing the reverb pot and replacing it with your tone cut pot is a good idea, if you don’t want to drill new holes in your chassis.
Looking at the pic of his board, where the 220k is, on my board is 22ohm resistor...hmmm.
Anyone know what the 220k does and where it's located in the schematic ?
I now have a pothole between the AC main and standy switches..any recommended alternatives starting with 500k linear pot ?..I have different values around here. A .005uf cap, and a .1uf to choose from.
I've done the boost knob bright cap removal, which removed some spike-cicles in HF reponses. [whew], pretty easy pull with curvenose pliers, once I loosened the pot'board.
Then I moved down to this one:
Tone Cut Mod
The AC15CC does not come with a tone cut control installed. Instead, it has a fixed value resistor which is set at 220K. This value simulates the tone cut control set at ‘no cut’ so the maximum amount of top end is allowed through. In my opinion, a Top Boost circuit needs a tone cut control to help tame the top end. You can install a pot so that you have a full tone cut control like an AC30. I have dropped the value of the tone cut resistor to 180K, which simulates the tone cut control set at about 10-11 0′clock, roughly. I find that with this setting and the tone knob on my guitar, I can keep the top end in check.
To perform this mod you need to follow the ‘Accessing the PCB Board’ guide above, as you need to access the main PCB board. Locate the resistor R23, circled in diagram below, and remove it. Replace it with the new resistor value of 180K, or lower if you desire. I used a carbon film 1 watt resistor here. If you decide to use a pot instead, solder the wires from the pot here in place of a resistor. As the reverb on this amp is quite woeful, removing the reverb pot and replacing it with your tone cut pot is a good idea, if you don’t want to drill new holes in your chassis.
Looking at the pic of his board, where the 220k is, on my board is 22ohm resistor...hmmm.
Anyone know what the 220k does and where it's located in the schematic ?
I now have a pothole between the AC main and standy switches..any recommended alternatives starting with 500k linear pot ?..I have different values around here. A .005uf cap, and a .1uf to choose from.
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