FYI There is no "Upgraded" or "V2" Willsenton R8

Ok before anyone jumps down my throat, it appears skunky designs isn’t a business, and she isn’t doing content for financial gain beyond donations that I can see.  She also doesn’t list any electrical engineering qualifications or certification licenses of any kind.  It just says she’s a hobbyist.  I guess that’s good news in that may lesson her liability if she ever got sued.  She may also be on the hook for libel if the guys at Willsenton feel their reputation has been damaged by her content.  If a kind lawyer out there reads this please drop her an email and provide some helpful guidance.  I’d hate to see her get sued when it appears she is just trying to be helpful to the diy community.  Maybe she could add a few disclosures to the videos and website.  

Good luck with that claim. She pretty much did a Cook’s Tour of the amplifier showing the things that weren’t good quality and the components that were below spec. She has nothing to worry about on the issue of "libel," not least because her attention was drawn to the device when she was consulted on a remedy for a major failure of one unit which she identified the defect in design and created a solution to fix it, which then Willsenton implemented ("please tell the jury why, if it was OK already, as you say it was".) Willsenton then also improved the quality of the resistors and capacitors, some of which were under spec, and a choke, also under spec. She compared it to a Muzishare amp at the same price point, which is totally fair game for consumer review.

She isn’t offering engineering consulting services, so the point about professional credentials is moot. She is a skilled hobbyist AFAIK.

YT isn’t the only web venue where R8 modders are active, they are on AK, Reddit and probably other places I have not seen. I have seen other mods different from hers on YT as well.

Willsenton made improvements in component quality and resistor placement. The overall design as a KT88/EL34 push-pull octal tube design didn't change. The amp has been a successful product in its original production and will presumably continue with its un-announced improvements.

Companies are not required to create named editions of products, which should be obvious.

I just confirmed my R8 has a 180ma choke which I could see without removing the bottom plate. My resisters look the same as the ones in the video, so I’m thinking willsenton implemented these mods over time. But I can confirm there are revisions with at least some of the parts changing over time. Not sure if these result in sonic benefits but I’m more inclined to believe skunky in thinking the revisions should at least make the r8 a little more robust. ChinaHiFi is being a bit careful in their wording and should have acknowledged these changes regardless of whether or not they result in sonic benefits.  

Well, here we are in April and this is the information on Amazon about the R8 (seller is Tube AmplyStore).

Description 

Currently sold in the United States is the Latest Model updated in December 2023. 
Currently sold in Canada comes with a 115/230V power switch selector.Due to storage capacity limitations, we are temporarily unable to send the Latest Model to Canada warehouse. Please choose to ship from TubeAmplifier ST got the Latest Model. 
Features 
Pure hand-made, the whole machine is welded with scaffolding. 
Use a square power transformer specially developed for this machine. 
The output transformer uses two high quality wideband EI output transformers. 
The voltage amplification and boost stage uses a 6SN7 for power supply filtering. 
The voltage amplification stage and the push stage use two pairs of 6SL7 and 6SN7 tubes, respectively. 
The rear stage uses four KT88/6550/EL34 tubes for class AB push-pull power amplification. 
Triode and ultra-linear selection are available. 
External independent BIAS-ADJ current display header. 
External EL34/KT88 tube selection function, easy to replace different types of tubes, adding endless fun. 
Infrared full-featured remote control. 
Use thick silver plated signal leads. 
With pure post-level function, it can be connected to independent preamplifier signal input. 
Power on mute delay function (about 30 seconds). 
Select Japanese ALPS high-end motor potentiometer. 
Easy-to-install plug-in tube shield. 

Product parameters: 
Frequency effect: 10Hz 40kHz (+/-0.5db) 
Total harmonic distortion: 1% (1kHz) 
Signal to noise ratio: 91dB 
Input sensitivity: 380mv (when Integrated amp input) 820mv (when pure power amp input) 
Input impedance: 100KΩ 
Output impedance: 4Ω, 8Ω 
Power supply voltage: 230V ± 5% (50Hz/60Hz) ~ 115V ± 5% (50Hz/60Hz) 
Machine volume (400*203*390) (W*H*D) mm 
Use vacuum tube: 6SN7*3.6SL7*2.KT88*4/6550EH*4/EL34*4 
Power consumption: 310W 
Net weight: 26kg 
Rated output power: 
25W+25W (RMS triode working state) 
45W+45W (RMS ultra-linear working state) (KT88) 
25W+25W (RMS triode working state) 
40W+40W (RMS ultra-linear working state) (EL34)

Features & details 

• The model currently on sale is the New Model upgraded in December 2023.
• One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. The default matching tubes of this machine is KT88. If you need another 2 new sets of tube, please purchase in addition. There is a Red selection button on the Back of the amp to switch.
• Can be used as an Integrated amplifier, power amplifier or Headphone amplifier. Pure hand-made, the whole machine is welded with scaffolding.
• Triode and ultra-linear selection are available, which can be switched by the button on the amplifier. With a remote control,Vacuum tube protective cover,Fuse and an English manual.
• We recommend that you spend 100-300 hours to RUN-IN this amplifier to get a better sound. Generally, you could get a better and stable sound after 100 hours, and you could get the best sound after accumulating more than 300 hours.

As you can see, the R8 was updated in December 2023. The description clearly states “New model”. What this means I don’t know, but there it is.