I installed the correct value and spec cap and have been running the amp most evenings for the last week. All is well, very pleased with such a humble little amp.
The only fault to occur is the concentric balance control was causing slight fuzz on one channel. It started to act funny where turning it all the way right would increase the volume and put the sound to the right channel. Turn to the left and it would distort and move the sound all the way to the left.
Having moved it from side to side several times and re centering the channels its performing fine again. I have no issues with the pots whatsoever, except for this little hiccup that seems to have cleared now.