Trouble finding exact resistor model number

[drummerdimitri]

I need to replace a couple of resistors in my headphone amp as they were fried when trying to use the amp to power small loudspeakers 

The original resistors are Dale 20 Ohms 1% T9 CMF55 0541.

I bought two models with identical resistances but with different temperature coefficients 100 vs 50 PPM.

The new ones have slightly different markings on them instead of T9 they're either T1 or T2 I assume this is for the different temp coeff. as mentioned above.

That being said however, I have no clue what the original T9's specs areas i could not find its datasheet.

Would it be ok to use either one 

[drummerdimitri]

I actually found out that the original resistors with a T9 value means that the TC is of 25 ppm.

Will adding resistors with TC values of 50 ppm affect the circuit in any perceivable way?

[mvs]

I actually found out that the original resistors with a T9 value means that the TC is of 25 ppm.

Will adding resistors with TC values of 50 ppm affect the circuit in any perceivable way?

You have not provided any schematics. What kind of answer you are expecting then?

1%/25ppm is 400 Kelvin. If this amplifier really needs resistors with such low tempco, it will definitely require calibration after replacement.
Perhaps also recalibration some time after to cope with aging.

Or the manufacturer has used better parts, then actually needed.