GI-7B tubes in SB-200

[oh8jep]

Hello!

Has anyone tried to rebuilt SB-200 working with russian 2xGI-7B triodes
they are very cheap (much more cheaper than 572B tubes) and based to parametres
better tubes than 572B? Naturally it needs separate filament transformer if those tubes used.

I can not push out from my SB-200 with Cetron 572B (not new tubes) more than 450W average,is more even possible?

Best 73's

Aatos OH8JEP

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