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Someone told me that the Jan and JG are the exact same. True or false. They sure sound different to me,, the Jan being 80's and the JG being 1963. The JG may be the same as a 5 star. Can I assume that 5 starr is "better" or different sounding? Thanks, Tweaker
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Some very good info in this string from knowledgeable folk!
The JAN and JG of the same vintage are the same tubes. The 5 star is a non-Military tube manufactured for the commercial market - Broadcasting stations, Aerospace applications, Medical etc.
Depending on vintage, the 5670 may have 2 double-thick or three micas.
I prefer the 5 star as they tend to have closely matched triodes and sound more organic to my ear (not as military or harsh)
I got caught up in the JAN vs JG designation when buying 5751 tubes. What I found it they may be the same tubes, they may not. I would pay more attention to the date codes, if they are still on the tube. Or you can use the getter as a guide.
I do believe the earlier ones, and presumably the most desirable, have a large closed O-getter. The later tubes have a smaller, open O-getter. Personally for whatever reason I preferred the sound of the later, open getter tubes. So to each their own as to what sounds better. Now, I know that the getter doesn't do a darn thing after the initial flashing. But it does help in identifying particular tube vintages that may sound different for other reasons.
Now, again all of that is for 5751.. no idea if it applies to the 5670 types.. oh well :)
Andrew
In general, and not always, the earlier tubes sound better if they are quiet.
I'll add that, somewhere in my past searches, the Five Star series was touted for reliability, well matched sections, very robust, and designated for military, medical, and other mission critical uses. Aircraft communications comes to mind. A solid ultra linear tube. The other dredged up memory has it that the factory line they came out of had an astonishingly low failure rate.
I understand from reading the old "Electronics" magazine....5 Star were the best GE made, for all of the reasons you stated.
"I can't compete with the dead". (Buck W. 2010)
Just looked up 5 starr and they are different in construction. Now on to Jan vs JG
JG is nothing more than the code the Mil used for GE. JAN is Joint Army Navy designation, which included all the manus who bid on and ultimately produced a batch of tubes under military contract.
5-Star were GE's equiv of RCA's Command Series....many used in commercial radio stations. Low noise, very close operating parameters between triodes (in dual-triodes, etc.
Hope this helps a bit.
jstrm
The tube I have experience with is the GE 5751. The JAN-GE while good for a JAN was a shadow of the 50s 5 Star and the JG that were made under contract. The % Star and JG sound similar but the 5 Star was better to my ears with a very full low end especially the gray plates believe it or not. I never cared all that much for any of them in the end The mids and treble just weren't up to the Sylvanias level of refinement in several important areas. Fortunately as the buying frenzy of Sylvania 5751 TMBPs simmered down and I could buy some.
Steve
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