thanks very much guys your replies have been extremely helpful.
I haven't replaced them yet, I just temporarily replaced the amp with an M50
but I will put 100 ohm ones in when I do it, since it is a V2 anyway.
will replace the resistors over the next couple of days and let you know how it goes.

thanks
I found some numbers underneath R1 and R51.

Hi guys, I have a ZX500v2 that I've had for a while, it has recently developed a turn off pop, and a bit of noise. So I opened her up to have a look and I found two blown resistors on the input board (pic attached). Picture is a bit average as I only have a cellphone camera but I'll try sort out a b...