that $300 could go toward a pair of US made Amperex orange label 7308s, or even the white labels. Each will give you some of the midrange warmth of the Mullards, but with more air at the top end and a sharper soundstage.
I personally think it would be just fine to buy used tubes (especially 6DJ8 family tubes which have 10k hour life) as long as it was from a reputable seller as has been already mentioned here. You will certainly save a ton of money if nothing else.
I personally think it would be just fine to buy used tubes (especially 6DJ8 family tubes which have 10k hour life) as long as it was from a reputable seller as has been already mentioned here. You will certainly save a ton of money if nothing else.