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In Reply to: RE: tube 6922 for prephono Bat posted by gustavosavarese on December 04, 2015 at 06:58:21
I prefer the sound of Voskhod 6H23p over Reflektor or others. The EB versions would be a smart choice in your application. I prefer JJ 6922 over all other currently manufactured 6DJ8 variants. They sound best to me in my CAT SL1. Very refined sound quite similar to Telefunken. The Philips tubes you mention are excellent tubes too, but as you say, difficult to find quiet ones now. If you like the tone of the Philips tubes, try the JJ but be sure to let dealer know they are for phono use and should be tested and selected accordingly. JJ makes them with steel pins and with gold. Go for gold. I had some bad luck with steel versions going hissy prematurely a couple of years ago, but the gold ones have been perfect so far after months and months of use. I have no idea if there are manufacturing differences other than gold to account for my experience, but as I said, no problems at all with gold pin versions and I use six of them in my CAT.
Follow Ups:
I'll keep an ear out for noise nasties down the road.
Opus 33 1/3
Henry, please let us know how they perform over the longer haul. The ones I had issue with were during that same time period when Jim McShane was having so much trouble with JJ reliability in general. Mine didn't last but about two weeks before they went hissy. It may have been more an overall production QC issue than anything related to the steel pin version vs. gold ones. I got rid of my steel ones and have only gold ones now, and as I said, they've been perfect.
Mike
I like the midrange lushness of the JJs but not the top end where the EH's shine.
Opus 33 1/3
Henry,
I was hacking around at the Tube Depot this morning doing some window shopping. I happened on their "Tube Comparison Tool" and clicked. They post some stats on how the various tubes they sell test. They have stats there for both the gold and steel versions of the JJ 6922, as well as others. Interesting point is that there is a measured difference between those two. The stats for the steel vs. gold are the same for all categories except for sensitivity. The gold versions produce a bit more current with the same input voltage. Not a huge difference, but a difference. I'm only guessing, but I suspect the two versions are identical except that the gold ones are selected at the factory based on some performance test characteristics and given the gold platting. I may have to break down and order some more of the steel ones and do my own compare.
Best,
Mike
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