I want to retube my Jadis JPL pre-amp..uses 12AX7s...Im wondering if I can use 7025 tubes or the low gain 5751..Wannabe audiophile needs some help...thanks
If I had a Jadis preamp (which I could never afford) I would stay with the tubes the thing was designed to use. YOu can spend lots of money for nos 12AX7's but that's as far as I would go.
You can substitute either. The 7025 was a low noise 12ax7 primarily used in Fender guitar amps. The 5751 has 30% less gain than a 12ax7, but it will work.
Yes, you can use both, but the 7025 can use 2 different grid voltages (-1 or -2). The -1 grid voltage has a plate voltage of 100, while the -2 grid voltage has a plate voltage of 200 which pretty much equals all characteristics of the 12ax7 tube. Hope this helps.
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