Tube rectifiers do compress the sound, because their output voltage "sags" under load. The effect is less apparent on smaller amps since they draw less current, but still noticeable in 18 Watters. The later, 20 Watters had SS rectifiers, which was one of the reasons they sounded different.Originally Posted by ledzepp29
More people seem to prefer the 18 Watter's tube rectifier, but taste is subjective. Guitar Player did a review of both of Marshall's reissues a few months back. See if you can locate that issue - it did a good job of describing the differences. Or, see if you can find a store with both the 18 and 20 in stock to try out.
Trinity might be willing to substitute a SS rectifier, or make it switchable. Can't hurt to ask....








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