Audio Research Ref 75 SE: Replace 20A IEC inlet with 15A

@russ69 I don't see how that would cause a future owner a problem unless they only have 20A wall socket. 

Eugene, I'm not a home wiring or amp design expert. Some mega amps have gone to 20 amp service requirement. Although I'm very unlikely to play at levels that require 20 amps, the amp manufacturer thinks that they need to wire the amp for a full 20 amp draw. Your solution of replacing the 15 amp connector with a 20 amp connector is a good solution with me guessing the power cable is over sized for 15amp usage. 

@eugene81

 Well, turns out changing the 15A female connector on my power cord is even easier. No heat shrink, all screw crimped to 3 conductors, so I will be buying a 20A female connector and changing it myself.

Case closed

Fully resolved outcome!

This amplifier  power dissipation is 500 watts maximum and 230 watts at idle. Only 4 KT 150 output tubes  and 2 6H30 tubes. Power storage is 520 joules. Pure curiosity,  why does it have a 20 amp cable requirement?  The circuit would never come close to this amperage. I wonder what the  ARC 20 amp  implementation  rationale is. Interesting. 

Charles 

15amp male?

so I will be buying a 20A female connector and changing it myself.

@charles1dad From the manual:

"The AC power source for the Reference 75 SE amplifier should be capable of supplying 10 amperes for 100 or 120 volt units, or 5 amperes for 220 or 240 volt units. For the very best performance on 100 or 120 volt circuits, the Reference 75 SE should be connected to its own AC power circuit branch, protected by a 15 amp breaker."

As for the reasoning: "Why does Audio Research use a 20-amp connector? Dave Gordon, brand ambassador, told me: 'The 20A IEC connector makes a tighter connection than the 15A IEC. We also spent a fair amount of time comparing 20A power cords, and we think the 20A cord sounds better.'"

https://www.theabsolutesound.com/articles/audio-research-vt80se-power-amplifier

@noromance I’m swapping in a 20A female connector on my power cord to fit the 20A male on the amp.

The AC power source for the Reference 75 SE amplifier should be capable of supplying 10 amperes for 100 or 120 volt units,

@eugene81 

Thanks,

So it was done due to subjective listening which I completely understand. I just couldn’t envision any “technical “ explanation as 10 amps is easily managed by a 15 amp rated power cable.

Charles