The Forte 1a has fuses, I had to go to an electonics supply store to find the exact match. If you open the top of the amp if there are fuses they should be pretty visible right away I would think.
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I'm not sure that your XA 160s have fuses. I am reproducing a few sentences from the XA 160 owner's manual:
The amplifiers voltage and current rating are indicated on the rear panel. It will be either 240 volts, 220 volts, 120 volts or 100 volts, all with a restorable type circuit breaker of the appropriate ampacity. The inclusion of this re-settable circuit breaker does away with the need for disposable fuses.