I want to build a dummy load for my tube amps, and I have a good idea of what I want to do and how I am going to do it, but I have a few questions. The amp is 120w class AB tube power Here is the resistor I am going to use with the amp set on 8Ω HL22507Z30R00JJ Vishay/Dale Wirewound Resistors - Chassis Mount I want the box to be able to act as a combination dummy load/fixed attenuator. Basically so I can hook it up as a dummy load and take the signal from the preamp of the amp (FX Send), or hook it up as a fixed attenuator and take the signal from the transformer into my recording device's line in. I have an idea of how I want to do this, but I need advice. I just wire the load resistor in parallel across the dummy load jack and attach connections from the load resistor across the opposite jack's connections so that current will only flow there when something is plugged into that jack, but in series with the tip connection on the "attenuator" jack is going to be a pad resistor correct? I don't assume that the 30Ω load resistor will pad the signal enough to actually plug it into my interface. What value resistor? Do the same wattage rules apply to this resistor? Or just something of good quality like a metal film 1 or 2W resistor will be fine? I am thinking that I may get some wire between 14 and 10 guage to do the internal wiring with because my speaker cable is 14gu and I don't want any splashback voltages or current throttling. I've been told that with a resistor of that wattage, I won't really need any heat sinks or fans, but I just want to make sure because I want to do it right the first time.