jbird said:Mesa amps are fixed bias, no bias needed! But you should state to a reputable tube dealer which amp you are ordering tubes for! They should give you a matched set of tubes that are within a specified range suitable for your Mesa. Did you order from a reputable dealer and state what amp these tubes are for?
jbird said:Mesa amps are fixed bias, no bias needed! But you should state to a reputable tube dealer which amp you are ordering tubes for! They should give you a matched set of tubes that are within a specified range suitable for your Mesa. Did you order from a reputable dealer and state what amp these tubes are for?
Shep said:they have to be baised for the mesa REcto amp or they won't last as long..
Shep said:they have to be baised for the mesa REcto amp or they won't last as long..
m@tstr@t said:jbird said:Mesa amps are fixed bias, no bias needed! But you should state to a reputable tube dealer which amp you are ordering tubes for! They should give you a matched set of tubes that are within a specified range suitable for your Mesa. Did you order from a reputable dealer and state what amp these tubes are for?
I bought them from tubedepot.com
Good or bad??? :?
m@tstr@t said:First hi to all!
I bought some tubes online (6l6gc JJ/tesla) and I would like to know if I need to rebias the amp with theese (rectifiers serie).
Thanks
disassembled said:Shep said:they have to be baised for the mesa REcto amp or they won't last as long..
Whoaaaaaa!!!!!! Not so fast there bud. This is not a true statement. You can place just about any matched set of tubes (6L6 or EL34) in your amp and they will be in safe operating mode and last as long as if they were graded to a specific amp. The Rectos are biased a bit colder to extend tube life, to give the amp a certain tone or feel. and to prevent premature tube failure. Most amp manufacturers do this as a compromise and since most people like the tone of their Mesa amp it would be safe to assume they picked a decent window to operate in.
The deal about getting tubes that draw a certain amount of current is that they will give a certain tone you are after (IE more grind, headroom, warmth, early breakup, etc). What this equates to usually is you want the warmest set of tubes to get you out of crossover distortion territory but you really can't get this with the 6L6 setting on a rectifier without modding the Bias circuit. If you read the link below it states that if you get a colder set of 6L6's and run the amp in EL34 mode it puts the tubes where they should be according to Bob at Eurotubes to have a warm responsive power section with as little crossover distortion as possible.
http://eurotubes.com/euro-n.htm
What you need to be worried about is if the tubes are matched well or not. Matched tubes draw similar amounts of current. Unmatched sets draw different amounts of current and can add excess hum to the output section and affect tone. Without a Bias meter from weber or alessandro you can know for sure if the tubes are matched well for sure but, heck, if it sounds good to you then you shouldn't worry about it.
Don't believe everything you read. Do your own research and come to your own conclusions. The info is out there.
jbird said:No, not all are the same! Which is why you should state ( to the dealer) what they're going in!
disassembled said:The only way to be sure is to measure how much current the tubes draw. My advice is to invest in a unit like the BR-2 octal:
https://weberspeakerscom.secure.powweb.com/biasrite/br_page.htm
That way you can see if you are safe or not. It's hard to rely on people sometimes.
If you are not able to measure the tubes on your amp then I strongly suggest that you DO NOT switch to the EL34 setting.
disassembled said:Shep said:they have to be baised for the mesa REcto amp or they won't last as long..
Whoaaaaaa!!!!!! Not so fast there bud. This is not a true statement. You can place just about any matched set of tubes (6L6 or EL34) in your amp and they will be in safe operating mode and last as long as if they were graded to a specific amp. The Rectos are biased a bit colder to extend tube life, to give the amp a certain tone or feel. and to prevent premature tube failure. Most amp manufacturers do this as a compromise and since most people like the tone of their Mesa amp it would be safe to assume they picked a decent window to operate in.
The deal about getting tubes that draw a certain amount of current is that they will give a certain tone you are after (IE more grind, headroom, warmth, early breakup, etc). What this equates to usually is you want the warmest set of tubes to get you out of crossover distortion territory but you really can't get this with the 6L6 setting on a rectifier without modding the Bias circuit. If you read the link below it states that if you get a colder set of 6L6's and run the amp in EL34 mode it puts the tubes where they should be according to Bob at Eurotubes to have a warm responsive power section with as little crossover distortion as possible.
http://eurotubes.com/euro-n.htm
What you need to be worried about is if the tubes are matched well or not. Matched tubes draw similar amounts of current. Unmatched sets draw different amounts of current and can add excess hum to the output section and affect tone. Without a Bias meter from weber or alessandro you can know for sure if the tubes are matched well for sure but, heck, if it sounds good to you then you shouldn't worry about it.
Don't believe everything you read. Do your own research and come to your own conclusions. The info is out there.
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