https://headmania.org/2014/06/18/aftermarket-cables-for-sennheiser-hd800/    Good link Cached

There are several suppliers of good quality audio cables , Norne Audio , Moon audio , If you're in Europe Forza audio works . I have brought cables from them all and they all do great quality cables , Do your research then try one and judge for yourself

The stock cable can be brought from around £180 and £250 depending on where you can find it, I Tried a few upgrades The best being from Norne audio , But it cost around £700 ,, Was it worth it .. I think so . But then again is paying £2000 for an amp And £100s for for interconnects ,, Again I...

I must add I have also fitted tube extenders in the lyr 2 which apart from looking good also helps with heat dissipation as the lyr is an hot amp 

Just checked the invoice ,Pair of E288CC, Telefunken Brought from Uraltone Amplification web store for 294euros , I brought them after reading on one of the forums that they were indeed the end game and a perfect match , And like I say in my opinion they were right , Having owned various amps...

Had quite a few of the cheaper tubes myself ,  What I mean by end game is considering the price of the lyr  spending the extra £200 on a decent pair of tubes elevates the amp to a level greater than the £600 total outlay compared to amps that cost a lot more,, The telefunken are performing...

Had both the lyr and the lyr 2 .. I have to say though expensive The telefunken E 288cc are the end game for this amp

Looking for a woo audio wa2 as I hear its a good match for the Senn HD800s which I own along with the Hifiman He1000v2 and the fostex Th900v2 among others, Current amps are Oppo HA1and lyr2 with upgraded Telefunken tubes