The only thing I see is people talking about tube upgrades and a couple mentioning DIY upgrades. Can you site a specific instance?
FYI There is no "Upgraded" or "V2" Willsenton R8
Some have said the R8 had been upgraded so I contacted China hifi.
I just received this email from China Hifi:
The R8 tube amplifier has never launched an MKII version, and has kept its original model and performance parameters unchanged. The factory has not made any major adjustments to the performance and circuitry of the R8.
The performance and sound characteristics of the R8 amplifier remain original. The factory will not change the model without public notice. The MKII version circulating on the market is purely misinformation.
We will maintain communication with the factory. If there is indeed a major upgrade or revision of R8 in the future, we will notify you in time. Thank you for your understanding and support. If you still have any questions, you can contact us at any time.
Willsenton Audio Factory and China-hifi-Audio