*more to come*

It is imperative that you read this section in its entirety before attempting any changes to the internal structures (mods, tubes, speakers, etc.) of your amp. Failing to do so could result in a serious injury, or even, a fatality.

There are capacitors all around the board of various voltages from high to low. It is advisable to consult the schematics.
Schematic version 1,Schematic for VK112 Version 1, ,Schematic for VK112 version 2, (cap47)

Pulling the chassis and poking around inside the amp however is dangerous deadly dangerous. There are two capacitors in this amp that have a 1000volts stored charge one with 630volts and a number with 400-550volts. Yes they can kill you.

The capacitors on the VK ARE NOT self-draining. I always always always check them with a multimeter. Don't assume. If they have voltage in them it can be discharged with a resistor of big enough resistance to alleviate a big spark. Hold the body of the resistor with insulated pliers, with one hand and don't touch anything with the other. Prebend the leads to match across each cap lead. Short the ends of each cap with the resistor for 20 seconds. Check again for voltage and repeat until voltage is low. The last voltage can then be drained by shorting + lead to the chassis without having a big lightning bolt appear. Use an insulated probe. You assume all risk. This is a guide and is your responsibility. I am not responsible if you work on your amp. Danger Will Robinson! (cap47)
Another method to use is an insulated test lead with a resistor at one end. Tape up all but the test end of the resistor. Clip the alligator end to the chassis and use the probe end to probe the socket of a power tube with the tube removed. Allways use a multimeter to check each pin position for voltage! Once you have varified the voltage is drained you can work on the circuit! This is now my preferred method, because radial capacitors cannot be drained with the other method!

You're not going to get shocked by touching the filter caps themselves. You just have to be touching the grounded chassis and touch any part of the board that leads back to the caps.(jason43)