HELP FINDING TUBE PRE AMP


Hey guys looking for a desktop tube pre amp, need that tube sweet sound, i have  $500 budget can you guys give me some suggestions please ?

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Thank you for your reply that looks like an interesting option.  I'm also looking at Xduoo TA-26 which is a very well reviewed headphone amp that also serves as a preamp read of people having good success using it as a preamp.

Look promising good reviews from what I'm reading so far can't seem to find one anywhere though where can I get one?