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I have used both Telefunken long plate and JAN Sylvania 12ax7WA's ( long plate ) in my 9.0 and I thought it was an improvement over the stock. Right now I have the Syvania in my 9.0, I wanted a ruggedized tube in there because I've been doing a lot practicing/gigging.
I like this amp.........Seems a bit punchier and beefier on the lows than the 6.0..
Would the valve be going out already? I'm not sure I understand what and where it is....
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There is no rhyme/reason to preamp tube failures. I've had amps where the preamp tubes were 20+ years old and never had an issue. And others where a relatively new one decided to go wonky. Luck of the draw these days.
You can see the tube through the grill on the top. I haven't swapped tubes yet (no reason - I'm not a tube roller) but I assume you just unscrew the top or outer case and then you can replace the tube.
Also as a stop-gap/emergency you likely can run your bass into the effects return and use the power amp section. That said I always have a backup amp in the car at ever gig I do.
Anybody using different makes of Tube? Perhaps Agedhorse could chip in with some info on premature tube failure?
Anybody tried a Groove tube? I had them in my Bassman back in the 70's and had no problems......given it's only one tube to replace now it's not such a cost issue!
There is no rhyme/reason to preamp tube failures. I've had amps where the preamp tubes were 20+ years old and never had an issue. And others where a relatively new one decided to go wonky. Luck of the draw these days.
Sorry if this has been covered, but is the High Frequency (attack) boost a peaking or shelving thing?
I was playing around a bit with turning the treble way down and using the boost. It seems to put the presence back in without the clank. FWIW I am a Pbass with flats guy but I play rounds on my five string.
I thought the aluminum knobs looked a little tacky, so ...

WHAT??? I respectfully disagree...


While TB rules demand respect for all members at all times, I'm not sensitive, so you can say you hate my guts for doing that, or whatever. I just like an understated look.
Also, I really like hearing my rigs played by other people, too. For some reason, they just sound so much better than me.