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GU-81M VACUUM TUBE review and TORROIDAL TRANSFORMER part1..

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HF amplifier GU-81m

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GU 81M Push Pull 2 x 1200W

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GU-81M pentode

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I Got A Couple Of GU-81M Pentodes...

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GU-81M Soft Start Trial

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Revisiting The GU81M: Probably Not The best Choice For A Linear Amp!

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Predisesors of the GU-81M: Part 1 (RS384, SRS502, RS684)

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GU-81M - AP Audio - test in home system audio_1

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GU-81M VTTC violent secondary arc over

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GU-81M plasma flame lash up 😁

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GU81M heating test ATX power source

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Unboxing A GU-81M Pentode

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Building a powerful GU-81m VTTC⚡

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GU-81M - AP Audio - test in home system audio_2

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Vostok - 1.5 KW HF linear amplifier using GU-81M ( GU81 GU81M ГУ81 ГУ-81М ГУ81М) tube - by YO6PMX

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