The 211 is a high power output triode, if I remember correctly. Similar to the 811.

I wouldn't worry about them failing. I guess if they were OK, 55 years ago, they should OK today. It was just an observation on my part about them.
They weren't used much in production equipment.
RE: the 211's they're using them in those pricey, Chinese built SE mono-block amplifiers, that are sold today. They were common in WWII, surplus transmitters.

This thread seems to have gotten way off the original subject. LOL

Heath got going good after The War and liked to design around what they could get cheap war surplus, which included the 12A6: I have a JAN 12A6 in a Heathkit.

That's what makes this website a little more interesting. Otherwise it would dry, like the rest of them.:sigh:

Heathkit GR-64 Transformer
 

HI:

Excuse my neophyte question, but I've seen posts before in the forum where folks have suggested rewinding power transformers.

I've seen the inside of many over the years, and all look impossible to rewind due to the lamination of the core being enameled/glued. That enamel looks pretty sturdy. How does one get the iron plates apart without destroying them?

I assume that step would require some sort of solvent, but what would you use that would not damage plastic or phenolic coil form parts?

Would the rewind have to destroy all the wire in all windings to get the enamel off. Does heat work?

Thanks!

Good question. It all depends on the materials used in manufacture. I have found some transformers relatively easy to disassemble, especially the lower power types. The big ones are steeped in tar and are well nigh impossible to take apart. The cost of new laminations is low, so it's really not worth it.

Many open windings are open at the termination and can be repaired without major disassembly. Shorts are another story.