Made by RFT. NOS in original boxes. Good/low microphonic performance. Lowest microphonics version recommended for combo amps. Great in your
Dr Z Route 66 amp
Matchless Clubman
Matchless DC30
65 Amps London
or any EF86 amp.
NOS in white boxes.
I believe this is the earliest version of the Mullard. VERY cool tone in every way.
NOS with Mullard markings in white boxes or GE labels and boxes (made by Mullard).
Found a few in the archives. These won't last!
A great alternative is the NOS Tesla EF806s (high grade EF86) https://www.kcanostubes.com/content/nos-tesla-ef806s-not-jj-high-grade-ef86
Another great one is the Amperex, Holland, EF86. Darios were made in Holland and appear to be identical to thise tubes https://www.kcanostubes.com/content/nos-amperex-holland-ef86