Good dear, I am new to this world of high quality audio, and I decided to start this year with an initial setup that gives me good listening quality. I subscribed to Tidal and Quboz so that they can offer me good sound quality and buy some equipment, now this past blackfriday, my first Sennheiser HD6xx from Drop that cost me $ 200, also seeing reviews encouraged me to buy a dac, because previously I didn't have, I also bought the Topping E30, and now I was looking for a good amp. Reading reviews they always strongly recommend that I get myself a tube amp, as compared to a solid amp, the tube amp could get the most out of my purchased headphones, that's why I made it to this part of the forum. I am encouraging myself to buy the Little Dot Mk2 for its cost benefit (180 $) and because it is a good amplifier to start with, reading the first pages and being new in this world it is difficult for me to read the more than 800 pages of this great post. That is why I ask you to help me please, I would like to update the tubes that come by default with the LD Mk2 (2x 6JI + 2x 6N6), according to my Aliexpress seller, he wants to sell me 2x 6JI for 10 USD and 2x 6N6 for 20 USD only For replacement in case the default ones get damaged, he also offered me M8100 / CV4010 for 50 USD and the pair of tubes JAN 5654 for 15 USD but it seems a bit excessive, since looking at the first page of this post, Dept_of_Alchemy recommended the Voshkod 6ZH1P-EV and the pair of these cost $ 24 shipping included and I feel they are the best I can get for now, because my budget is short, I found them on ebay:
https://www.ebay.es/itm/ Voshkod-6ZH1P-EV-6J1P-EV-EF95-Matched-Pair-2-Difference-New-Old-Stock / 142890748468 My question is if I am doing well to buy these upgrade tubes on ebay, and if I need a replacement for the 6N6 to order them on aliexpress ($ 16 pair) in case the ones that come by default should fail, or maybe there are better power tubes on ebay and what would they be. Thanks a lot.