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LambofGod
Guest
????????5150 combo, power tubes and pre amp tubes!!! thanks in advance!!!!!
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LambofGod
Guest
Re: IF you put new stock tubes do you still need to re bias????
so youre saying that maybe i dont have to re bias ??
adrian said:
so youre saying that maybe i dont have to re bias ??
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LambofGod
Guest
Re: IF you put new stock tubes do you still need to re bias????
no they are not auto biasing!!
also where can i find the stock replacements tubes from peavey ?????
marvar said:
no they are not auto biasing!!
also where can i find the stock replacements tubes from peavey ?????
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Zerberus
Baron Von Shred
Re: IF you put new stock tubes do you still need to re bias????
IF you´re not using a matching system like GT or MEsa that allows you to select tubes within a specific tolerance, the amp should always be rebiased after a power tube swap if it´s not auto-biasing (which is actually just a fixed bias in most amps)
In other words: if you switch tube brands, you´re rebiasing or rishing damage... again, the exception being auto-biasing /fixd Bias amps such as Mesas and (mk.I) 5150s
IF you´re not using a matching system like GT or MEsa that allows you to select tubes within a specific tolerance, the amp should always be rebiased after a power tube swap if it´s not auto-biasing (which is actually just a fixed bias in most amps)
In other words: if you switch tube brands, you´re rebiasing or rishing damage... again, the exception being auto-biasing /fixd Bias amps such as Mesas and (mk.I) 5150s
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Gearjoneser
Gear Ho
Re: IF you put new stock tubes do you still need to re bias????
JJ's tend to be middle of the road, bias-wise, so you can pop'em in and they'll be fine. I think the 5150's are a fixed bias, and run a bit cold unfortunately, so the JJ's will heat it up just right, tonewise. I highly recommend GT12AX7C's for highgain amps. They'll do a great job of tightening up the preamp gain.
JJ's tend to be middle of the road, bias-wise, so you can pop'em in and they'll be fine. I think the 5150's are a fixed bias, and run a bit cold unfortunately, so the JJ's will heat it up just right, tonewise. I highly recommend GT12AX7C's for highgain amps. They'll do a great job of tightening up the preamp gain.
wixedmords
New member
Re: IF you put new stock tubes do you still need to re bias????
You always need to check your bias, with any amp, to make sure it isn't off the charts. You may get away without doing it for now, but it isn't right. One day you will find an amp that is biased to high, the day you will pull the short straw.
auto-biasing isn't a term, sorry guys, no such thing.
cathode biased = bias usually isn't adjustable, but can be. The amp is able to handle tubes that vary in bias within a range. Think of this as "more forgiving".
fixed bias = your bias needs to be checked and adjusted to a certain spec or range.
You always need to check your bias, with any amp, to make sure it isn't off the charts. You may get away without doing it for now, but it isn't right. One day you will find an amp that is biased to high, the day you will pull the short straw.
auto-biasing isn't a term, sorry guys, no such thing.
cathode biased = bias usually isn't adjustable, but can be. The amp is able to handle tubes that vary in bias within a range. Think of this as "more forgiving".
fixed bias = your bias needs to be checked and adjusted to a certain spec or range.
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LambofGod
Guest
Re: IF you put new stock tubes do you still need to re bias????
anyone also? thats know about this?
anyone also? thats know about this?
