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You wont find these at the average hamfest - more likely, you will have to mail order them from an NOS dealer. I've seen them at Triode Electronics in Chicago, and a few other dealers sell 'em too. If, on the other hand, after the RCA experiment I liked what I heard then I might then spring for the Amperexes.The Tech Talk (now that dates this e-mail doesn't it? They take the basic RCA clear top sound to another level entirely, thought the degree to which they sound better is a bit system dependent.
Just to get the formalities out of the way here first - Yes NOS tubes do sound different from current production tubes. My opinions are based on using this type in my system in 4 different preamps over the years - most recently in the output stage of the Thor. Brands and versions I have on hand include: Amperex 12AX7 Bugle Boy Holland I've also owned and heard the GEs in the past but thankfully don't have a pair on hand at the moment ;-) Now, regarding nomenclature - the CV numbered tubes are British military tubes labeled according to the British Military numbering system - they are still just 12AX7s. Added to this are other sonic artifacts unique to each tube.
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] [ Shady ] [ Support Our Asylum ] [ Chat ] [ Reviews ] [ Inmate Systems ] [ Gallery ] [ Forum Rules ] Posted by Joe S on March 04, 1999 at : Here's an edited version of an e-mail I sent EDP regarding 12AU7 experiences in his time of need.
Mullard CV4004 box plate - very extended at the extremes, great frequency response overall in fact, but maybe even more fuzzy than the usual 12AX7.
Amperex 12AX7 - now this one is a bit more interesting.The bright balance of this tube is great complement for this kind of gear, but drop it into current broad bandwidth tube gear (like the Thor) and you might just get sonic hell - all for just to a tube!