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I have some NOS RFT/Seimans, labeled Brinmar, made in East Germany...farmed out from Siemens, perhaps in the 70s ...as I read up on the MB 450, I am thinking that these are different tubes. Aren't the MB 450s made in Germany...
From cursory surfing, I thought the 470 was different from the 450 also...definitely a lot cheaper. If you get good information on the tubes or try them, please let us know your impressions. They sound interesting.
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All Modified: Balanced Transformer-DIY Strip/Shunyata Defender-RevolutionMacMini/Amarra-KTE Singxer/Gustardx20pro-ZBIT-CSP3-OldChen 300B/845, Torii IV, Simple Wave 300B-HR1/SVS Micro3000sub-Pi PCs-DIY PCs, ICs, USB, I2S, Speaker-SR and aluminum w ball bearing feet
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