Hello, I got a Vox Valvetronix VT20X "Modeling Combo Amp" from my neighbor, but it's missing a small board which was broken, removed and never replaced. In fact I don't even have the broken board. However I do have pictures which I found online here.
Can you help me reverse engineer the circuit pictured below, or suggest a DIY replacement of some kind?
The Board takes a 12V input from an external (laptop-like) power supply and feeds power to the main board via three wires. There are no markings on the board regarding voltage. As this is an audio application maybe it's purpose is to "clean" the power?
A few other details:
VonB
Can you help me reverse engineer the circuit pictured below, or suggest a DIY replacement of some kind?
The Board takes a 12V input from an external (laptop-like) power supply and feeds power to the main board via three wires. There are no markings on the board regarding voltage. As this is an audio application maybe it's purpose is to "clean" the power?
A few other details:
- I have contacted vox customer support directly, and they don't provide anything beyond operational support for their products.
- I also contacted several authorized VOX service centers (I literally called like four of them in my area) and understandably they all want me to physically bring the amp in so they can look at it. I explained to them it's a DIY fix project, but none could provide schematics or spare parts.
- As far as obtaining a new PCB, they seem to be only sold as a set of 5 boards costing more then the value of the amp.
- Also, you may say "forget fixing this, not worth it!" which I agree, however this is a fun problem solving project and i'm having my son help out.
VonB