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DIY For Audio
Rotel cdp with tube output stage
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<blockquote data-quote="Gramophone" data-source="post: 57321" data-attributes="member: 527"><p>Thanks Hi-Phibian. Seems you are quite knowledgeable on this topic <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>According to the 991 technical manual it uses the following op amps:</p><p></p><p>2x Phillips NE5534AN</p><p>2x Phillips NE5532AN</p><p>2x OPA2604AP</p><p></p><p>Only 2 of the 6 op amps in total are therefore OPA2604 units. It seems from feedback on the Net that the NE5534AN and NE5532AN are somehow inferior to the Bur Brown OPA2604. Would you recommend replacing these 4x Phillips units with OPA2604 units as well??</p><p></p><p>Some other suggestion I came across is to replace the existing caps in the power section with bigger caps. There was an AE version of this player apparently with bigger power caps and upgraded ops amps.</p><p></p><p>The player is very revealing and transparent already but any additional warmth gained will always be welcomed <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Gramophone, post: 57321, member: 527"] Thanks Hi-Phibian. Seems you are quite knowledgeable on this topic ;) According to the 991 technical manual it uses the following op amps: 2x Phillips NE5534AN 2x Phillips NE5532AN 2x OPA2604AP Only 2 of the 6 op amps in total are therefore OPA2604 units. It seems from feedback on the Net that the NE5534AN and NE5532AN are somehow inferior to the Bur Brown OPA2604. Would you recommend replacing these 4x Phillips units with OPA2604 units as well?? Some other suggestion I came across is to replace the existing caps in the power section with bigger caps. There was an AE version of this player apparently with bigger power caps and upgraded ops amps. The player is very revealing and transparent already but any additional warmth gained will always be welcomed :) [/QUOTE]
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DIY & Tutorials
DIY For Audio
Rotel cdp with tube output stage
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