Marshall Amp Forum - View Single Post - Preamp Tubes?

MartyStrat54 · 06-06-2009, 02:59 PM

RATT

Sorry to hear that not all of the tubes are good. Without a tester, about all you can do is play them and see if they work. The only problem with an AX7 is that it can be pretty run down and still sound good. I've discussed this before where I said a worn out AX7 can work solidly as a 12AT7. So sometimes it is tough to say whether an AX7 is still putting out a gain factor of 85 to 100.

Even if only two of them are good, you've come out ahead.

Marty

06-06-2009, 02:59 PM	#428 (permalink)
MartyStrat54 Senior Member Join Date: Feb 2009 Location: Formerly Phoenix, now north of KC Posts: 7,925	Re: Preamp Tubes? - Who, What, When, Where, Why, and How? RATT Sorry to hear that not all of the tubes are good. Without a tester, about all you can do is play them and see if they work. The only problem with an AX7 is that it can be pretty run down and still sound good. I've discussed this before where I said a worn out AX7 can work solidly as a 12AT7. So sometimes it is tough to say whether an AX7 is still putting out a gain factor of 85 to 100. Even if only two of them are good, you've come out ahead. Marty