Kurt Cobain’s Crest 4801 Power Amp
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Shop NowKurt used this amp from around January 1992 (as confirmed in the comments, it was first used on January 24) for the majority of Nirvana’s live performances. The amp was used together with a Mesa/Boogie Studio .22 Preamp – both of which were mounted on a rack shelf often seen sitting behind Kurt on stage.

Prior to January 1992, Kurt used a Crown Power Base 2 power amp instead of this amp.
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Last time Crown Power Amp 2 used:

01/11/92 – NBC Studios (Saturday Night Live), New York, NY
Next show:
01/24/92 – Phoenician Club, Sydney, Australia
First time Crest 4801 used
https://www.youtube.com/watch?v=_nGfTgP0NNQ
Kurt used it since the Australian Tour at the beginning of 1992 – Appearing of Earnie Bailey