Tubes for 3x12ax7b + 6z5p


Lookin for some 12AX7 tubes for my upcoming pre-amp (for speakers). What would you reccomend? I need three of these and budget is about 100 usd. The amp will be a cheap chinese nobsound one, using 3x12ax7b + 6z5p

I was thinking about Tung-Sol, Gold Lion or maybe this

Any other suggestions?

Also, the amp will have 6Z5P tube rectifier - i could not google much about this tube type. Or do rectifier tubes need to replaced at all? Or it does not matter that much and I can just replace the