I cannot state with conviction that this is how other manufacturers may wire their fuse holders, so you should look for yourself if you plan to install HiFi Tuning fuses in amplifiers or preamplifiers other than McIntosh. This particular fuse holder wiring scheme is the way McIntosh routes the incoming 120 volts AC. As I suspected, the voltage path through the fuse holder is toward the rear of the amp.
This discovery motivated me to pull my C1000C out of the rack, remove the cover and examine the fuse holder. In other words, the fuse arrow is pointing toward the fuse holder cap. After several days of auditioning I decided to reverse the direction of the fuses, and surprisingly discovered the systems sound better with the fuse arrow pointing toward the rear of the amp. Initially, I installed the fuses with the arrow pointing into the amplifier. I take this to be an indication of the direction the fuse should be installed in the 120 volt circuit.
The HiFi Tuning fuses have a symbol printed on the barrel with an arrow. I had to order another 500mA HiFi Tuning Supreme fuse for my C2300 because on my initial fuse order I neglected to notice the C1000C controller required two fuses, so I used the fuse I ordered for the C2300 as the second fuse in the C1000C. I have installed the HiFi Tuning Supreme fuses in my C1000C controller, MC2301 amps, and MC601 amps.
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