Dodger,-Sorry-my-spacebar-is-broken......I-have-recently-been-given-a-Stromberg-AR420-Custom-Four-Hundred.-I-know-nothing-about-this-amp-except-that-it-is-old-and-mono.-Any-info-you-can-share-with-me-about-this-would-be-greatly-apreciated.-------Thanks,-Tal