I wanted to give everyone an old new idea.
12B4A tubes will work as drop in with an adapter.
The adapters have become very common on eBay ~$10 each... $25 for 2 to your door.
The 12B4A is an amazing tube, its different but sounds amazing.
The 12B4A tubes are VERY inexpensive and NOS.
And Oh by the way... they nearly double your power out.
Measures are from a brand new Encore 8/32 with input transformers and caps headed to a customer.
On av. there will be ~10% more power after break-in.
As good 1626 are still easy to get, its not such an issue but its fun to roll.