#1
Hi! how often am i supposed to change the tube in my amp? i've had my amp for at least 1½ year. and i hhave loved it but lately i have been having trouble getting decent tone when i use it on hi gain. is it time for a tube change?
#2
Yes, one and a half year between every tube change is normal, maybe even a bit too long. Get a new one.

I am not sure about how much those amps really use the tubes but I don't think it will cost a fortune, isn't there only one tube in there?
#3
I assume your amp only has the one pre-amp tubes. It should last a lot longer than a year and a half, depending how ofen you use it
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#5
I believe the valvetronix amps have 2 preamp tubes. From what i remember looking at my friend's, it doesn't look to easy to access the tubes. I could be wrong, though.
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#6
will they last shorter if i use a distorsion pedal alot? cause iv'e used a metal muff quite alot....
#7
That depends. If the level of your pedal is so high that the tube itself distorts (which by the way might be a great way to get the pedal to "bond" with your amp), then tube life can be a bit shorter but I don't think it'll be anything major.
#8
Quote by johlin
Yes, one and a half year between every tube change is normal, maybe even a bit too long. Get a new one.

I am not sure about how much those amps really use the tubes but I don't think it will cost a fortune, isn't there only one tube in there?



Not really accurate. More like 180 hrs of use. I f you play 2 hrs a day then yeah, but 2 hrs a week you got some time. It's all in the usage.
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#9
does all preamp tubes fit in all amps or are there different connctions and stuff so i have to find something with a special connection that fis vox amps?
#11
yeah i think it's 12ax7 to... anyway, i guess that info should be in the manual---
#12
Quote by johlin
You need the right kind of tube (which I think is 12AX7).


Although that does beg the question. Will the valvetronix profit from a different type of tube? will a 5751 make any appreciable difference?
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#13
well I'm not really too interested in experimenting right now, I'm just happy if i get my tone back. but this should work, right?

Link
#14
Quote by scott58
Although that does beg the question. Will the valvetronix profit from a different type of tube? will a 5751 make any appreciable difference?


That is a very good question. I've only tried that once with a 12AT7 in the preamp of my AC15 and the only difference I noticed was how early/late it would break up.

I think I remember seeing that the AD series have got a push/pull power amp on some models so maybe you could put different tubes in the sockets (12AU7 and 12AX7 for example) to get asymmetrical power amp distortion (if you can even crank it that far)
#15
If youve suddenly noticed a difference in tonal change, and havent messed with any of the settings such as the Eq, it is probably time to change the tubes.
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#16
Quote by space_ace__
well I'm not really too interested in experimenting right now, I'm just happy if i get my tone back. but this should work, right?

Link


Yes, that one will work. There are however cheaper ones to be had and if I recall correctly the Mesa Boogie tubes are just relabeled version of those cheap ones.