Diodes on the Finals Plates..?

[PCollen]

What is the purpose of the three series diodes to ground off each of the power tube plates in the Express ? Is this soley for clipping (2.1Vdc threshold) ?

[jaysg]

circuit protection, also found on the Ampeg V4-B:

http://ampgarage.com/forum/viewtopic.ph ... des+plates

[collinsamps]

If you have ever had the total lack of pleasure experience of replacing blown ones in a Peavey classic 30 you'll mount them somewhere to get to.