I put 6L6GCs in my VH4 two weeks ago to capture it into my Quad Cortex.
I tried 28mA per tube at first, but it didn't sound right to me,
so I increased it to 53% at 33mA, and it sounded perfect to me (thru 2x12 K100s, on top of 2x12 V30s).
When I switched back to KT77s, I set the Bias at 32mA...