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

Not a tech expert but I’ve had a signal tube go bad in an integrated amp as well as in a DAC and in neither case did the component shutdown. Also, I have 11 gauge power cords on my 3 tube integrated amps, zero issues.

Just for clarification, the larger the gauge number or awg, the smaller the wire is, not bigger. For example, 10 awg is a larger diameter than 12. As mentioned previously, when you check the outlet’s wiring, make sure the ground wire is firmly connected. If you have an outlet tester, use it. If you aren’t using a high quality outlet like Hubbell, now would be a great time to install a Hubbell hospital grade outlet. Most 20 amp circuits use 15 amp receptacles unless it is a dedicated circuit. Hope you don’t need the amp repaired.

Electrical devices will attempt to draw whatever current they need - and no more than that. 12 Ga. is likely just fine for anything reasonable but having 10 Ga. won’t "hurt" anything. Just a bit overkill. I mean, your own house wiring from the junction box is only 12 Ga.

Moonwatcher, unfortunately, it isn’t safe to assume the home has 12 gauge romex. If the panel has 20 amp breakers, then the wire is probably 12 gauge. If the breakers are 15 amp, the wire is probably 14 gauge. This can vary by local codes and builder. Some builders try to save money and use both 14 and 12 gauge based on the intended use. 

There are many posts here that assume that small tube amps don't need a heavy power cord.  Nothing could be further from the truth.  I hooked up a 6 wpc tube amp to a stock 14 awg power cord and was disappointed with the bass.  Assumed it was just a fact of life with a small tube amp.  a few days later a friend suggested a heavier power cord.  I didn't think it would help but had one available.  I was shocked.

Bottom like, the power cord supports fast changing dynamics such as bass notes.  tube amps often don't have robust power supplies that can supply this ready power and must reach back into the power cord.  OTOH, if your amp has huge caps in the power supply, you may not see much difference.

Jerry