just dropped in a NOS 60's Tung Sol black plate 6550 ... wow relavator moment for sure.... Sourced from Andy at Vintage the bottle shape does contact the damper on adjacent tube..
immediate thoughts better depth of image sharper attack midbass up thru midrange smoother than the stock tube
Yes , did buy aprox 8 years ago , from a retailer in Canada , for my REF 3 and for my CD7 . They last 2 times the lifetime of the regular tubes . The sound , more dynamics in general .
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