7308 tube code question

nice score! (let me know if you want to part with any of those). they are US Navy Amperex, made in Holland, 1965 most likely. VR5 is the code for 7308s. the delta signifies made in holland. White is the earlier ink that Amperex used (generally). Should do well in a phono pre. Those are a low-noise variety of 6922.

-Ed

Ed's right re: 7308, and I'm second if you decide you don't need/want'em. They are a great replacement for any 6DJ8 or 6922 (or E88CC or ECC88).

I also have these tubes and if NOS they will require a minimum of 30-40 hours, or so, of use for the bass to kick in and for them to open up. In gear that runs them easy you may have to double this - plus. Just to say, give them some time. This was one of my favorites in the input section of a SET amp that I no longer own. Very odd for Amperex 6922 types to take this amount of time/use in order to open up, but this has been my experience with them.

I think he said it was a * on the bottom row, which signifies made in USA.

The delta, or triangle at the beginning of the bottom row denotes Holland. If it was an F it would be France. All three countries made them based on the same design in Philips-owned factories.