Tomcy6, thanks for your additional information. I found those tube code pages on the web, but still couldn't decypher them. Seeing how you used the code and what it means now makes sense...thanks again.
Mullard Tube Code Help
Hey guys! Could someone please help me identify the following Mullard Tube Codes. These always really confuse me. Thanks so much for your help!!!
"F33 B8K3"
"F31 B91"
"F33 B8K3"
"F31 B91"