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Me too! So, is the glass broken or is the cardboard to try to protect from hail?

I started my tube journey over 10 years ago with a hybird Yaqin 2100 amp with tube preamp and SS rear. Excellent amp along with several of the EL 34 amps which are exceptional for the money.   I have never owned an American tube amp but, have owed several Mc Intosh amps, SS for comparison.  Fast pace and to 2024, I am on a 3rd tube amp, lol. Not funny, lol. I tried the OldChen K3 Kt88 twice with the same transformer failure.  More on that later if interest.  China Hi Fi refunded my money with no problems.   This brings up the Willisenton R8 KT 88 amp.  It is a moderate priced amp and a back breaker going on 60 lbs.  The topic is tube rolling and this is the easiest amp that I have ever had that you can audibly hear a change with multiple tubes, preamp and power. The bias adjustment take about 10 second for a power tube and not needed for the preamp tubes.  Preamp tubes for the amp are Willisenton  6sN7x3 , PS Vane Fever CV 181z, Shuguang Black Treasure CV181z, and Willisenton 6SL7.  The rolling power tubes were the Shuguang Black Treasure KT 88 , Willisenton KT 88, PSVane KT88, Tel Funkenl Black Diamond EL 34, and an old quad pair of Sevlanta 6550 C winged quad on a trade for my NOS Tung Sung EL 34 tubes.   Well, I am very impressed with this amp and it's sound.  The tubes can make or brake a system. This amp has very noticeable changes in tube rolling and can be transformed by tube rolling.  I am not going to bash stock tubes because they most likely come from the same factories and are not inherently bad.    The change of the Power tubes changed the bass and lower midrange. Where as, the preamp tubes influenced the midrange in this particular Kt 88 amp.  The point of the post is the fun with rolling, not the cost, lol. and the quickness for comparison.  These    topic are always so biase and less than scientific.  because it took 20 min. for the tubes to warm.  This thread is not that serious.  What's your take?  I did find some nice combo with my current  tubes without spending more money.  The old motto is nothing exceeds like excess!   See, I did not tell you about about magic tubes,  the must have amp, system . or made SS comparison.  Just roll with it.🥴  Rolling is not like steak or lobster, it is more like skirt steak vs t bone?                    

Will do , thank you 

@Rudy81  I thought it would be nice to edit your photo so we could see more details of the speakers but if for any reason you would rather I didn’t just let me know and I will delete it.  

I wondered but it's your box.   

There are a lot of things going on between SS and tube gear.  Tube gear  can't have the accuracy of SS due to the tubes and design. Tube integrated amps usually will handle 4 an 8 ohm  loads.  That can and can't be the case with SS avr, and integrated amps.  Tube amps can operate with different tube and design factors that can affect the sound.  Impedance swings should not be a major factor unless the amp / speakers are grossly mismatched.  Impedance fluctuates widely.   Additional watts for the most part are about bragging about a big beast when only a fly swatter is needed.  I have class D, Class A/B and tubes, I have driven my RF 7 's, Forte, Mc Intosh speaker and other with 25-1000 watt amps.  No real diff with gain adjustment in my listening levels.  

Not one person noticed the cardboard...   🫣

Switching amps or power supply can result in a sonic difference.  For instance with a tube switching from triode mode to ultralinear will be perceived immediately due to the increase power. Bass control is easier with SS gear compared to tube gear.  This warmth or sterile terminology is not the best wording.  Some tube amps appear more warm due to distortion for the most part and suit high sensitivity speakers.  SS, better control of all frequencies for the most part.    I don't compare my SS gear to the tube gear.  I like class A, class A/B, Digital and tube gear.  One is not better than the other, it's the user's implementation toward their goals.

I think I've heard that tubes and Class D SS do a better job of handling impedance swings. I would like to know if that is correct and how that affects what we hear.

Good question. I loaned the Aiyima to my grandson a few months ago, so I haven't tried it for quite a while. And, I've been using the preamp section of the Marantz to feed the ACA, so that hasn't really been used as a full-on integrated for more than a year. My memory is, the sound of the Marantz and the Aiyima are not that far apart. The ACA provides more detail...just a very clear sound. I would describe the Marantz and Aiyima as more of a warm sound.   I've only been listening to the Fisher for a few hours. My initial impression is that it sounds very much like the ACA with a touch more warmth and a slightly more expansive sound stage. The big difference is in the bass. I described it to my brother-in-law as more controlled and powerful. Not any deeper, but definitely more robust. I have my listening space in the basement and for the first time ever, I could feel the bass coming through the floor when I went upstairs. I'm sure the Aiyima would do that, too, but I've never played it in this house so I can't compare them head to head.