Sonzera 20 Power Tube Confusion

[Beach Radio]

My 2019 Sonzera 20 came with Ruby 6L6 GCMS power tubes. I see the 2021 Sonzera is listed as having 5881 power tubes on the PRS web site. Does anyone know if I am safe to use jj 5881 power tubes as a replacement for the stock 2019 Ruby 6L6 GCMS set in my 2019 Sonzera 20 (with a bias adjust 30mV)?
Thanks!

 

[shimmilou]

As cold as the bias is in this amp, even true 5881 would be fine, and the JJ are certainly fine.