Marshall JTM30 Fixed!

I picked up this ~1995 English made Marshall JTM30 with a single 12 inch speaker in non-working condition. Watch to see the fix!

[@MurnerJoel]

I still have one I bought when I was teenager

[@davidstorm4015]

The successor to this amp (JCM600) had an adjustable bias pot from factory and also a vent in the top of the cabinet to promote better airflow

[@MrKkprince]

Replacing the Zener with a 15v has the effect of biasing at 15x3 = -45Volt . Way too low maybe ? I choosed a 12v instead