[TenTec] Centurion Amplifier history

[Speer, Doug]

I'm looking at acquiring and adding a Model 422 Centurion to my Ten-Tec station line up.  Can anyone tell me or point me to the history or evolution of the Centurion?  Questions I have are:   any differences other than cosmetics between the Model 422 and the current Model 422B?   Any  updates that should be performed on the 422?   Are there any production runs (i.e. serial number ranges) that should be avoided?  I've done a cursory internet search but have not found a good history.

Doug, W9PN
Janesville, WI


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