Tubes Asylum: Re: what about between phillips 6922 and BB's 6dj8's by JFB Questions about tubes and gear that glows. FAQ

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Posted by JFB (A ) on September 23, 2002 at 14:49:51

In Reply to: Re: what about between phillips 6922 and BB's 6dj8's posted by chriss on September 23, 2002 at 13:56:18:

I can't add much to the following section from Joe's Tube Lore in FAQ:

A Note on Numbers
The 6DJ8 family was originally developed by Amperex. The first tube in the family was the steel pinned 6DJ8 followed by the gold pinned 6922 and 7308. These latter two were premium versions rated as 10,000 hour life tubes. The 6922 was a premium industrial version and the 7308 was the top of the line guaranteed low noise version. Frankly, I’ve measured & listened to a lot of these and there is no correlation between model # and sound quality. Some of the best sounding tubes in this family are 6DJ8s and some of the worst are 6922s & 7308s. So take each tube on it’s own individual merits rather than judging it by its model number or pin material (gold pins do not necessarily = better sound). The Europeans used different model numbers to identify these tubes, by the way. In their numbering system the 6DJ8 was an ECC88, the 6922 was an E88CC and the 7308 was an E188CC. Oh, by the way, a 7DJ8 is basically a 6DJ8 with a 7 volt heater voltage rather than the 6DJ8’s 6 volt rating. What does 6H23N mean? Who the hell knows! I sure don’t.

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