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help ID tube with no marks

Please need help to identify a tube with no marks .

Came in a custom Single ended stereo 300b amplifier from Japan that also use ECC82 tubes. It is a 9 pin tube and use 6.3v filament, overall high close to 66mm, 51mm without pis and exhaust tip, 20mm wide. No marks, letters or numbers on glass. The tube on amplifier use only pins 1,2,9 and 4&5 filaments. Wiring details wrote on photo.

PHOTOS ATTACHED

THANKS

Attached Images
File Type: jpg 150108_0024.jpg (191.4 KB)
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