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RE: Picked up a quad of 6GM8

All of the Dutch made tubes are Amperex. As well Valvo Hamburg made these tubes. The only other manufacturer of these tubes that I'm aware of was Telefunken. All of the US labeled tubes that I've seen are one of these. The original Earmax headphone amp from about 15 or so years ago used two of these tubes. More recently one of the Wavelength DACs use one of these tubes. Every once in a while there is someone in Europe selling NOS NIB quads of Telefunkens on ebay and they can be had reasonably as long as you don't get into a bidding war. There is a Russian equivalent numbered 6N27P but I think these are about as rare as the western European tubes.
Cheers, Steve

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