Melsi said:
hmmm so whats it gonna be the 6072 or 5751?
...if you research the 5751, as I stated earlier, you'll see that is a recommended alternative to the 12AX7, thus a very viable option in guitar amps and mic pres that originally utilized the 12AX7 tubes...
...I have tried the GE 5-Star 5751 in my mics and although somewhat similar, the lower gain factor of the 6072 (45) makes it a better choice in microphone applications...the lower the tube's gain factor, the more preamp gain is needed to get volume up to par when recording...the low microphonics (noise) that is characteristic of good quality 6072/6072A tubes combined with that lower gain factor are what make the 6072 the best of the 9-pin 12A_7 variants in a microphone application (IMHO)...
...if the 6072 is good enough for the Elam, Tele, Lawson and Manley Reference mics, it's good enough for me (and my sE)...as I stated earlier, the 5751 has become more popular due to the increasing scarcity of other variants (such as the NOS 12AX7 and 6072)...
...the choice of course is yours...
sound125 said:
Interesting, as many GEs dual triodes were made in the UK and considered desirable over the American varients. Likewise, the same thing with the Euro made Amperex valves, which were considered highly desirable over the versions made in Hicksville, NY, especially the *PQ*s out of Holland.
BTW, I am quite fond of the GEs and have used them in many circuits over the years. Yet, I still prefer the construction and sonic characteristics of teles, mullard and siemens, over the GE. Just a preference, of course.
...that may well be, but when it comes to the 6072/6072A, all of the GEs (both 5-Star and JAN variants) that I own (about 2 dozen) are marked "Made in the USA"...
...on the other hand, many tube mics like the RODE NTK and K2 use a 6922, in which case the Siemens and Amperex versions (German and Dutch respectively) are the preferred variants (E88cc for example)...
...in my experience, what works well in amplifier circuits (such as a guitar amp) most often doesn't translate to use in microphone applications and vice versa...as I've said before, that's IMHO...my $.02 if you will...