So I bought the Willsenton R-800i

Finally I found the time to do some tube rolling. It really started bugging me when I wrote recently that I didn´t properly compare the new ones I´m using with the stock tubes for example.

To cut a long story short: The tube combination I was running before still sounds best to my ears. Still some things I heard surprised me.

I listened to five tracks:
Bob Marley & The Wailers – „Natural Mystic“
Lee Morgan – „The Sidewinder“
Bastarda & Sutari – „Tam nad puszczaj“
Zbigniew Wodecki with Mitch & Mitch – „Wieczór już“
Phoenix – „Tonight“ (feat. Ezra Koenig)
I left out rock music because I wasn´t in the mood today. Also Guided by Voices, which I was tempted to include just to see how well a decidedly badly recorded piece of music is handled.

The source was my old Rotel RCD02 CD-player, I took the EQ out of the chain. Speakers as always Cornwall IVs.

805

Cossor – instruments more seperated than with others, sound a bit sharper (quicker transients it seems)
stock Willsenton (I think PSVane Hifi) – fuller sound, more bass boom (low end), overall nicer than Cossor
PSVane Acme – lush, general pleasant, round bass, coherent, voices glow

300B

stock Willsenton (I think PSVane Hifi) – slightly boomy and muddy compared to Elrog
Elrog – more presence and glow, overall just nicer

6SN7

PSVane CV–181 T2 – very good, but sounds maybe a bit too thick, less laid back, nice highs and lows
GE GTA (NOS) – deep low end, overall really good, not 100% clear, good presence in lower highs
6H8S (NOS) – relaxed, defined, maybe a bit generous with highs, beautiful but not very 3D
stock Willsenton (6H8S NOS) – coherent, lots of low end, very similar to other 6H8S
Sylvania GTB – relaxed but forward, sweet, I´m sticking with this for now, but GE and the 6H8S come close

Next up will be another round with the 12AX7/ECC83s, maybe the rectifier too, but I´m done for today.

Further observations:
– Replacing any tube makes a difference (rectifier the least). The overall sound did not change dramatically when changing the 805s and 300B, but enough to go from really good to great.
– Only the combination of the PSVane Acme 805s and Elrog 300Bs made the overall sound just sweet and glowing.
– I was surprised to find the Cossor least appealing of the three pairs I own. Surprised because I paid about $200 for them and they turned out to be less pleasant than the stock ones.
– No surprise concerning the 300Bs though. It would be really interesting to compare them with Western Electric and Takatsuki. Feel free to get in touch with me if you have a spare pair.
– The stock 6SN7s are also really convincing, better to my ears than the GE GTAs and the also pricey CV-191 T2 from PSVane. My first choice remain the Sylvania GTBs though, they do their job better overall. But just a bit so if they start failing at some point I won´t be desperate.
– I guess it´s because the Cornwall IVs lack a bit on the low end while overemphasizing the highs for my taste, but the sound is most pleasing when I put the EQ back in the chain and push the lows just a tiny bit. The other bands stay untouched, except for when I sometimes bring even the highs up a tiny bit. I know it sounds like a contradiction to what I wrote about before, but both help to make the sound fullest along the whole spectrum. The stage widens as well, it´s always a surprising effect, when I turn the EQ off and back on again.
– I still have to try other 6SN7 NOSs, if only they weren´t all so expensive.

@chmaiwald , GREAT write up. Thank you very much.  I know everything is system dependent and subjective but I'm going to pause on buying Cossair 300Bs based on what you say--may not be worth it.  

Also, fyi, I run two subs with CW IVs. You are correct in that CWIVs are not bass monsters despite their size.  I love the sound of two subs tailored into the lower octave only.  

Finally, I heard back from China Hifi today.  They said that 120ma is the maximum you should bias the amp. They have no recommendations on what's ideal. They said that 100 ma (where mine maxes out with full bias) is fine and you can go lower.  

As such, 120 ma is the limit.  Your mileage may vary, but you may want to turn your bias down from 120 to (a) see how it sounds) and (b) avoid running the power tubes so hot to save life.  

My Carver Crimson has a recommended top end bias of about 100 ma, but Bob Carver says he likes the sound best at around 80ma.  Interesting. 

At any rate, the manual uses ambiguous language and I have now confirmed that 120ma is not the recommended bias setting but the maximum bias setting a user should use. 

@jbhiller  Yes, I think you are saving money not buying the Cossors. And the PSVane Acme really shine but they do cost a lot. Luckily we won a court case this year about a faulty installation. It dragged on for years but in the end the decision was in our favour and the other side paid in time. Otherwise I would´ve had to save much longer for these and the even more expensive 300Bs. My limited experience now is in line with what I read elsewhere: The expensive ones do stand out. So far I have not read about a cheaper secret contender. That´s different from the 6SN7 and 12AX7 positions, where even I could name some that can make you very happy for cheap compared to the expensive holy grails of (usually) NOS tubes.

Thank you for passing on the info on biasing. That´s really helpful and I will try it out as soon as possible. I never bothered to try other values since I thought that 120ma is the only one I should aim for. Improving tube life and (possibly) the sound at the same time – irresistable.

Chmaiwald,  I'm wondering if the stock 805s in the Willsenton R800i 805 are actually Linlai tubes. The reason I think that is some Linlai tubes, and their 805s, have a star shape at the top of the tube structure.  

Take a look at the photos here of Linlai 805 offerings and there's a star at the top: 

https://premiumvacuumtubes.com/product-category/shop_by_tube_model/805/

Do yours look this way? 

@jbhiller I´m not at home at the moment, so I can´t say with a 110% certainty, but I´m pretty sure they´re not Linlai. I haven´t noticed the star shaped thing at the top and as far as I remember the socket is golden – just like the PSVane Hifi.

I´d also be surprised if they put in a 450$ pair instead of a 140$ pair. Retail prices of course, but still. Maybe they couldn´t get hold of the PSVane and to fulfill the order took Linlai for yours? If so, congratulations!