Mesa Mark iii

[theboogieman]

Hey I got one tube on my Mark three 60 watt combo burning red-hot and the other is fine, anyone have any ideas what this might be from?

Cheers, Matt

[52 Bill]

Hey I got one tube on my Mark three 60 watt combo burning red-hot and the other is fine, anyone have any ideas what this might be from?

Cheers, Matt

Here are some of the possibilities:
1-Bad Tube
2-Bad Tube Socket
3-Bad Bias Feed Resisitor
4-Leaky Coupling Cap in the Phase Inverter.

Start by swapping the two tubes. Does the same tube still red-plate or does the same socket red-plate?