10 gauge power cord. Too much power for tube amp?

Are power tubes or signal tubes more sensitive to incoming voltage issues, or amplifier power protection issues, which can lead to an amplifier shutting down?

No, if anything they’re less sensitive to incoming voltage issues than solid state components. But a bad power tube might draw a lot more power which could trip protection circuitry. Why don’t you tell us about the actual amp in question?

No chance 10 gauge has any negative effects… the gauge unless tiny is not going to change voltage fluctuations. In every case… for instance in installing direct lines, and power cords, larger gauge has produced better sound quality.

Also, @mulveling +1

Amplifier shutting down is going to be caused or enabled by some issue not related to the gauge of power transmission.

Something’s going on, but it’s not the power cable.

I’ve used one of these on a tube amp. It lived up to the hype, but after many scotch tape repairs to the candy wrapper (as approved by Pierre’s staff) I switched to over priced fancy stuff.

Just in case you didn’t, did you check the power cord for nicks? If the male and female ends are operable did yah look there too? This is 99.8% sure not to be it.

Did you switch cords? Tap tubes for microphonics? Swear a lot?

The amplifier is a Mc2301 from McIntosh that's giving blinking red lights after warm-up frequently. Power tubes have been replaced with new ones, maybe it's a signal tube. Sometimes it works fine, as long as amp stays on for at least a minute after warm-up.