gofar99 Messages: 1947 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi, I just saw this thread and wanted to add a bit of information to it. I use 5751s in several designs. Mostly Jan Phillips and Sovtek ones as they cover the warmer and hotter ends of the range. I find both to be great in Oddwatt amps. I tried a batch of JJ ones in the same amps and they do not work well. The sound was quite inferior to either of the other two types. The ones I got were constructed differently as well. The internal structure looked more like a 6J6 RF tube than any of the 12A_7 or variants. Certainly not like the 5751s I was using. They have small square anodes set low in the bottles. I made the recommendation (as much as I really like JJ tubes) to not use them in any of the Oddwatt designs.
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