How much hum is normal from a new tube amp

If the manufacturer does not offer to eliminate the issue - and it IS an issue - or if they refuse to replace the defective amp, then return it immediately. You should hear no hum from the transformers of a new amp. I have (reluctantly) discarded products that over time have developed a pervasive and musical enjoyment-destructive hum in the transformers. As I understand it this is not something you can fix other than replace with brand new transformers. If you hear it now with brand new transformers, imagine what it will be like as those transformers age.

I have a KT150 amp. There is a very faint hum from the amp on start-up, that goes away once it's fully on and warmed up for a few minutes (it has a 2 stage power up process). Otherwise it is really quiet. 

I sometimes hear a very faint hum/clicking sound from one speaker but I have to get very close to hear it and I know that is from the modem.

No hum here, ever. 

@macg19 

The seller TMR has been great. They are going to take it back inspect and either repair , replace, or refund my choice. Which amp do you have? If I can ask.

@auroravengeance 

How long have you owned the Lab12 Integre4 MKII. Im asking because i heard the the hum can develop later or if you have a slight hum it can get worse.