What kinda if tubes can i replace the stock ones with once they burn out?

Hello, you can buy these tubes. https://www.amazon.com/dp/B087LXW6RL

Can the fosi t2 headphone amp work with the fosi Q5 dac

Assuming you mean the p2 headphone amp, yes, it will. You'll need an RCA cable to connect the two.

Was everyone satisfied with the quality of the vacuum tubes provided? If not, what might be a worthwhile upgrade?

I've sampled Brimar 5749's and GE 5654's and the ones that came with -- the differences are subtle (the tubes on this are only for the pre-amp stage) -- no complaints for the $50 price tag -- it's as good as any headphone amp I've tried under $150 and mine has been working perfect for over a year

Item dimensions L x W x H	12.7 x 12.7 x 2.5 Centimeters
Voltage	12 Volts
Manufacturer	Fosi Audio
Mounting Type	Surface Mount
Brand	Fosi Audio
Number of Channels	2
Brand Name	Fosi Audio
Output Wattage	5 Watts
Colour Name	Black
Product Dimensions	12.7 x 12.7 x 2.54 cm; 500 g
Item model number	P1
Item Weight	500 g

P1

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