Different tubes

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I’m wondering what tubes should I use in my DSL100HR, in the preamp stage and power stage. Currently I have all 4 EL34’s power tubes and all 12ax7’s in preamp stage. It sounds ok but kinda like it’s missing something. I heard somewhere KT88’s sound great.
 

EADGBE

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Use only EL34/6CA7 power tubes and ECC83/12AX7 preamp tubes for that amp. My favorites are JJ EL34 and JJ ECC83S. The new Svetlana EL34 and Tung-Sol EL34 sound good too. I don't trust Chinese EL34s myself. If you want to boycott Russian products go with the JJs. Remember the amp needs to have the bias checked and or adjusted after each power tube change.
 

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