Official Blackstaramps Forum

Hi everyone, This may seem like a stupid question :-( I have a series one 100 head and have just bought a ht212 cab to go with it (was using a marshall 2 x 12 before) question is this: if i take 2 leads from the back of the amp into the two inputs into the cab what should I set the amps impedence se...

Hi everyone im using a series one 100 head and have just got some harma pre amp tubes. Can I simply just pull out the old ones and put the new ones in ?
Many Thanks in anticipation
Sean