#1
My bass amp has a preamp in it and theres a little tube in back how do u know when to change it?Will it just not work anymore or what?
Quote by Damaged Roses
I don't really understand why basses have 24 frets, I mean, I've never seen a bassist playing more than the 12 fret.


My Gear-
Warwick Double Buck
Epiphone EB0
GK MB 210
Fender Rumble
#2
preamp tubes need replaced pretty rarely. when it goes out the amp will not make sound anymore. I'd suggest buying a few preamp tubes that are compatible. assuming it's a 12ax7 preamp tube(which is the standard) an ECC85 is also compatible. No two tubes will be identical and between the brands and those two types you can get quite a variation in tone. since you only have the one tube it won't make a HUGE difference but it should be noticable. It's always good to keep a spare since replacing a preamp tube is as easy as pulling out the old one and putting the new one in. no biasing required.

Edit: what amp is it?
dean edge one 5 string
Schecter studio-4
Samick fairlane-6
Ibanez sb900
Ibanez btb775
Fender p bass special deluxe

Dean Del Sol
Ibanez prestige rg2610

Peavey TKO 65
Peavey vb-2
Quote by the_perdestrian
listen to revelation, for he is wise in the way of bass-fu
Last edited by Revelation at Sep 18, 2009,
#3
Its a ampeg ba115t
Quote by Damaged Roses
I don't really understand why basses have 24 frets, I mean, I've never seen a bassist playing more than the 12 fret.


My Gear-
Warwick Double Buck
Epiphone EB0
GK MB 210
Fender Rumble
#4
Ah. it's not a 12ax7. it's 12au7. which i consider a bit odd since this type seems to usually be used as a driver tube between the preamp and the poweramp in most all-tube amps. but that's what they chose i guess.

here's a link to a list of compatible tubes.

http://www.vacuumtubes.com/12au7.html
dean edge one 5 string
Schecter studio-4
Samick fairlane-6
Ibanez sb900
Ibanez btb775
Fender p bass special deluxe

Dean Del Sol
Ibanez prestige rg2610

Peavey TKO 65
Peavey vb-2
Quote by the_perdestrian
listen to revelation, for he is wise in the way of bass-fu
Last edited by Revelation at Sep 19, 2009,
#5
Quote by The1bassist06
My bass amp has a preamp in it and theres a little tube in back how do u know when to change it?Will it just not work anymore or what?


All Bass amplifiers have a preamp it is where the tone is created that the power stage amplifies
A valve/tube in the pream stage is quite frankly a bit of a gimick to appease the valve/tube purists.
I have an ECC83 valve/tube in my Ashdown RPM1 preamp which is optional via a blend control but I never use it.
G&L L2500
Squier Affinity Jazz Bass 5
Ashdown RPM pre-amp
Ashdown Little Giant 1000
300 watt 15" powered cab
450 watt 15" powered sub bass cab
2x10 + horn
1x15x10 + horn