New Tubes For Peavey Valveking VK100

[Leonidas706]

I have a Peavey Valveking VK100 head and I would like to get some new preamp tubes for it. I was thinking about getting a matching triode of the Electro-Harmonix 12AX7's. The tubes I have in the head now are 12AX7's as well but made by a different manufacturer. The head is fixed bias. I was wondering if I would have any problems just plugging in the new tubes and playing it. Any help would be great. Thanks

 

[azazello]

Some times tubes from different brands have diff. modes and need adjusting.