So yes, a different rectifier tube type WILL affect tone. But if a tube is giving 350v, it's 350v whether it's a NOS tube or a chinese new production. All a rectifier tube does is rectify AC into DC. There's no DC in your tone signal (tone signal is AC), so in that regard, no they do not effect tone.

Are rectifier tubes important?

The function of the Rectifier Tube in a guitar amplifier is to convert AC voltage from your power source to the DC current used in the internal operation of the amp's circuitry. ... The overall response is 'spongier' and causes the strings of your guitar to feel more elastic and often easier and 'more juicy' to play.

Do power tubes make a difference?

As rock music was demanding louder and larger amplifiers, makers started using larger power tubes. Here come the 6550, KT88, KT66, and KT77. They are known for more headroom and a harder edge when they eventually distort.