Some of the new production 6L6GCs have a higher Ip and will need rebiasing regardless, so stick with the same brand and number and company that puts the number on the tubes and you should be OK. Biasing is not exact anyway. There is a range that is OK. Cool and dirty sounding to hot and cleaner sounding to burnem up fast. The burnem up fast setting for bias I get requests for with the Ruby tubes. Self biasing is usually a cathode biased amp. I think you have a set biased amp. It can be reset.
@LeonoSalomo There's some companies that put out tubes that are bias tested, and have a number on the side corresponding with the bias. Such as like 1-10. If you get a set of 7's say, and have the amp biased to use them. Then you should be set to not need rebias-ing each time you replace those tubes.
hey man im looking on retubing my amp, but i dont want this to happen, i have a Kustom 72 coupe hardtop, apparently it can self bias its self, when i put new tubes in do i just turn the power on and leave it and let them warm up? what do i do man?!
hey man im looking on retubing my amp, but i dont want this to happen, i have a Kustom 72 coupe hardtop, apparently it can self bias its self, when i put new tubes in do i just turn the power on and leave it and let them warm up? what do i do man?!
what does baising mean? what does self baising your amp mean? and how do you even do that?? im realy confused on this stuff, i have an amazing mesa boogie triple rectifier amp and i dont even know this stuff! :( someone please help me out here
The "bias" of an amp is similar to the idle of a car. It is the safe (often center) operational point of a power tube. And although the Mesa Triple Rectifier could be biased (it is a fixed bias amp similar to most class AB tube amps), Mesa doesn't included a variable pot inside the amp. Therefore when replacing power tubes, either use Mesa tubes or purchase tubes that measure "mid range". See my videos at tubedepottv or contact me at "tech(at)tubedepot(dot)com" for more information.
@Blink182PunkRocker biasing is when the voltage is set to match the tubes that you put in the amp. every time tubes are replaced, the amp has to be baised. some amps do not require biasing as they are cathode-biased, such as the newer vox amps
Oh my gosh... that tube is fully arcing. I'm surprised the fuse didn't blow immediately. Be sure to check the 470 ohm / 2W screen resistor after this.
This tube was probably dead well before being installed. I suspect that it was either gassy or one of the internal elements were shorted. If you want to see a great video describing the various elements of a tube, do a youtube search for "journey to the center of a tube".
@babyblues3270, hmmmm I'd look into that. Maybe the voltage or something is overpowering the tubes. Check where you plug in your amp. Make sure you have an outlet that olnly has yer tube amp in. If it's a new amp, the tubes coulda been damaged from shipping. Try replacing them and see what happens.
I think I have it down. I now realize why my orange tiny terror sometimes sounded so awful when I went through my phase of trying all these old different tubes in place of the ax7's. I was trying all sorts of stuff. Even the ultra low gain au7 was in there at one point. at7's where a fav of mine too. Got some really 60's garage sounds doing that!
The amp I'm using right now is the Blackface AB763 by the way. I think it's a '67. Thanks again!
preamp tubes do not require bias adjustment, only power tubes. the tonal variations you found are the reason so many people like to swap preamp tubes, it's plug and play tonal shaping!
@Dragooncabs my fender hot rod deluxe amp is doing the exact same thing, only one of the tubes are doing that though. i dont know what to do, should i just buy a new set of power tubes 6l6's.?
@beardo16662 Yes, I work in this buisiness. For 25 years!! My advice is to RUN to a tech. What you see on my video was caused by a selfmade work. The guy thougth he could do everything by hisown. That's the result. If U R a musician, PLAY YOUR GUITAR!! :-D If U R luky U'll have to change only powertubes and have the right BIAS made by a REAL tech. If U use the amp in this way U'll have worst problem on circuity.
I really don't get this biasing business. I'm about to change out my rectifier tube, and might even go with a solid state replacement, but I wanted to also get a normal U4G tube so I could go between the two to suit my purpose.... So, I can't do that without biasing the amp each time?
And even if I do decide to just keep the same tube in all the time, I have to get my amp rebiassed just for that tube change?
Any info would help... Thanks! (I have a 67 Super Reverb).
There are a lot of different model of Fender Super Reverb: AB568, AA763, AA270, AB763, AA1069 etc etc....
Anyway this kind of amp has, as you said, a rectifier tube.
Supposed that your amp is in a good and right bias setup for the power tubes mounted (I mean exactly for the mounted tubes, not for the family of tubes):
When changing with another rect tube, you will have no bias problem because internal tension will be similar, so regulation will be the same, even if we always advice to check bias out periodically on those old amps, and every time you change something in.
It can be switched to a solid state rectifier adapter, but you WILL NEED REBIAS (or you risk an underbiased amp). This because, on Fender Super Reverb, bias circuitry is outstanding from rectifier tube circuitry and when passing to solid state rectifier your amplifier will have a boost on tube anodic supply BUT NOT ON BIAS CIRCUITRY that will result with having not enough tension respect to power tube anodic tension.
(tube rect, usually, delivers less Voltage than solid state rect, and draw more current)
To switch between tube and solid state rect you MUST rebias with solid rectifier mounted on: this way you are protected while using solid state rectifier and you will have a overbiased amp when using tube rectifier, that will result in a less power output, different tonal character, but no failure risk.
Best: set bias for solid rectifier and write it down, set it for tube rectifier and write it down, create a small circuitry driven by a switch to toggle between the two situation.
IF YOU REALLY DON'T GET THIS BIAS BUSINESS :-D DON'T TRY DO IT YOURSELF! ;-)
Buy a Mesa Rectifier amp like mine. It has solid state silicon diode rectifiers and 3 of the 5u4g rectifier tubes. You can have the best of both worlds at the flip of a switch. You also have another switch for bold/spongy setting.
1 cel con telecamera pronto al momento giusto!! ;-) La storia riguarda un cliente che comprando delle valvole di finale rispose al nostro avvertimento che avrebbe dovuto biassarle:"IL BIAS NON ESISTE, ho cambiato le finali + di una volta così senza fare altro e non è mai successo nulla"....fino ad ora... ;-) E' poi tornato lamentando "un rumorino"! altro che rumorino! Ciò che "non esiste" gli ha fatto un bello scherzo! valvole andate e ampli andato...ora è l'ampli che non esiste + !
if you blew your tubes, fried components, and blew the OT then maybe you should have turned off your amp instead of recording it.
thuglyfe91332 2 weeks ago
Mmm sounded like popcorn in the microwave
AntaresX9 6 months ago
One of my tubes started doing this... does that mean that it's not just the tube that is broken?
HarvesterBob 6 months ago
@HarvesterBob and the tubes wasn't new and I had done no changes to the amp bias or something like that.
HarvesterBob 6 months ago
1.21 Giggawatts!!
KitchenMarshall 7 months ago 3
if i hade a tube amp that hapend than i would not be very happy
TheLeadguitarboy 7 months ago
Some of the new production 6L6GCs have a higher Ip and will need rebiasing regardless, so stick with the same brand and number and company that puts the number on the tubes and you should be OK. Biasing is not exact anyway. There is a range that is OK. Cool and dirty sounding to hot and cleaner sounding to burnem up fast. The burnem up fast setting for bias I get requests for with the Ruby tubes. Self biasing is usually a cathode biased amp. I think you have a set biased amp. It can be reset.
Satchmoeddie 10 months ago
My amp is "self bias" yet 2 of the 4 tubes glow purple and make loud popping sounds as if it needs biasing.
AWretchedCreature 1 year ago
Wow.That looks like too much anode voltage or a short.Poor amp....
FeCr3 1 year ago
hello.. if i buy a pair match power tube, could i just replace it plug and play, without bias it first
LeonoSalomo 1 year ago
@LeonoSalomo There's some companies that put out tubes that are bias tested, and have a number on the side corresponding with the bias. Such as like 1-10. If you get a set of 7's say, and have the amp biased to use them. Then you should be set to not need rebias-ing each time you replace those tubes.
Wolfesscythe117 1 year ago
hey man im looking on retubing my amp, but i dont want this to happen, i have a Kustom 72 coupe hardtop, apparently it can self bias its self, when i put new tubes in do i just turn the power on and leave it and let them warm up? what do i do man?!
kodieperkins 1 year ago
hey man im looking on retubing my amp, but i dont want this to happen, i have a Kustom 72 coupe hardtop, apparently it can self bias its self, when i put new tubes in do i just turn the power on and leave it and let them warm up? what do i do man?!
kodieperkins 1 year ago
OH MY GOD THAT WAS AWESOME. my deepest consolations about your amp my friend. may its circuitry rest in peace.
MyManDan 2 years ago
what does baising mean? what does self baising your amp mean? and how do you even do that?? im realy confused on this stuff, i have an amazing mesa boogie triple rectifier amp and i dont even know this stuff! :( someone please help me out here
Blink182PunkRocker 2 years ago
The "bias" of an amp is similar to the idle of a car. It is the safe (often center) operational point of a power tube. And although the Mesa Triple Rectifier could be biased (it is a fixed bias amp similar to most class AB tube amps), Mesa doesn't included a variable pot inside the amp. Therefore when replacing power tubes, either use Mesa tubes or purchase tubes that measure "mid range". See my videos at tubedepottv or contact me at "tech(at)tubedepot(dot)com" for more information.
TubeDepotTV 2 years ago
@Blink182PunkRocker biasing is when the voltage is set to match the tubes that you put in the amp. every time tubes are replaced, the amp has to be baised. some amps do not require biasing as they are cathode-biased, such as the newer vox amps
BMGStammer 1 year ago
Well at least it was pretty. Fireworks!
crittoprrr 2 years ago
Oh my gosh... that tube is fully arcing. I'm surprised the fuse didn't blow immediately. Be sure to check the 470 ohm / 2W screen resistor after this.
rhull07 2 years ago
oh my god his tube is dead now. is that tube even operable after that?
erjohnson227 2 years ago
This tube was probably dead well before being installed. I suspect that it was either gassy or one of the internal elements were shorted. If you want to see a great video describing the various elements of a tube, do a youtube search for "journey to the center of a tube".
TubeDepotTV 2 years ago
I have a crate vintage club with 4 el84 power tubes, and I get that crackling like in the video, what does it mean?????
babyblues3270 2 years ago
faulty tube,oscilation,bad catode resistor...ets can be few resons...
jigibao 2 years ago
@babyblues3270, it means your tubes are worn out, and you need to repalce them. if you dont, youll break other parts in your amp like capacitors.
InFuriatedShadows 2 years ago
@InFuriatedShadows wat if the tubes are brand new?
babyblues3270 2 years ago
@babyblues3270, hmmmm I'd look into that. Maybe the voltage or something is overpowering the tubes. Check where you plug in your amp. Make sure you have an outlet that olnly has yer tube amp in. If it's a new amp, the tubes coulda been damaged from shipping. Try replacing them and see what happens.
InFuriatedShadows 2 years ago
thank you very much
babyblues3270 2 years ago
wow... thanks for the long reply dragoon.
I think I have it down. I now realize why my orange tiny terror sometimes sounded so awful when I went through my phase of trying all these old different tubes in place of the ax7's. I was trying all sorts of stuff. Even the ultra low gain au7 was in there at one point. at7's where a fav of mine too. Got some really 60's garage sounds doing that!
The amp I'm using right now is the Blackface AB763 by the way. I think it's a '67. Thanks again!
freezazoid 3 years ago
preamp tubes do not require bias adjustment, only power tubes. the tonal variations you found are the reason so many people like to swap preamp tubes, it's plug and play tonal shaping!
monkeyxx 2 years ago
We are not talking about preamp tubes!! ;-)
Anyvay U R right!
Lorenz
Dragooncabs 2 years ago
@Dragooncabs my fender hot rod deluxe amp is doing the exact same thing, only one of the tubes are doing that though. i dont know what to do, should i just buy a new set of power tubes 6l6's.?
(u seem to know a bit about this buisness.)
beardo16662 1 year ago
@beardo16662 Yes, I work in this buisiness. For 25 years!! My advice is to RUN to a tech. What you see on my video was caused by a selfmade work. The guy thougth he could do everything by hisown. That's the result. If U R a musician, PLAY YOUR GUITAR!! :-D If U R luky U'll have to change only powertubes and have the right BIAS made by a REAL tech. If U use the amp in this way U'll have worst problem on circuity.
Lorenz
Dragooncabs 1 year ago
@beardo16662 if you still need help with your amp i can help you i have fixed amps tube tvs and amps for a while now and i can fix it right
metalmanin 1 year ago
I really don't get this biasing business. I'm about to change out my rectifier tube, and might even go with a solid state replacement, but I wanted to also get a normal U4G tube so I could go between the two to suit my purpose.... So, I can't do that without biasing the amp each time?
And even if I do decide to just keep the same tube in all the time, I have to get my amp rebiassed just for that tube change?
Any info would help... Thanks! (I have a 67 Super Reverb).
freezazoid 3 years ago
FIRST PART REPLY
Hi freezazoid,
There are a lot of different model of Fender Super Reverb: AB568, AA763, AA270, AB763, AA1069 etc etc....
Anyway this kind of amp has, as you said, a rectifier tube.
Supposed that your amp is in a good and right bias setup for the power tubes mounted (I mean exactly for the mounted tubes, not for the family of tubes):
Dragooncabs 3 years ago
SECOND PART REPLY:
When changing with another rect tube, you will have no bias problem because internal tension will be similar, so regulation will be the same, even if we always advice to check bias out periodically on those old amps, and every time you change something in.
Dragooncabs 3 years ago
THIRD PART REPLY
It can be switched to a solid state rectifier adapter, but you WILL NEED REBIAS (or you risk an underbiased amp). This because, on Fender Super Reverb, bias circuitry is outstanding from rectifier tube circuitry and when passing to solid state rectifier your amplifier will have a boost on tube anodic supply BUT NOT ON BIAS CIRCUITRY that will result with having not enough tension respect to power tube anodic tension.
Dragooncabs 3 years ago
FOURTH PART REPLY
(tube rect, usually, delivers less Voltage than solid state rect, and draw more current)
To switch between tube and solid state rect you MUST rebias with solid rectifier mounted on: this way you are protected while using solid state rectifier and you will have a overbiased amp when using tube rectifier, that will result in a less power output, different tonal character, but no failure risk.
Dragooncabs 3 years ago
LAST PART REPLY
Best: set bias for solid rectifier and write it down, set it for tube rectifier and write it down, create a small circuitry driven by a switch to toggle between the two situation.
IF YOU REALLY DON'T GET THIS BIAS BUSINESS :-D DON'T TRY DO IT YOURSELF! ;-)
ALWAYS REFER TO A QUALIFIED TECHNICIAN.
Cheers
Lorenzo G.
Dragooncabs 3 years ago
Buy a Mesa Rectifier amp like mine. It has solid state silicon diode rectifiers and 3 of the 5u4g rectifier tubes. You can have the best of both worlds at the flip of a switch. You also have another switch for bold/spongy setting.
petedogg369 2 years ago
Bellissimo! :D
IraTenaxG 3 years ago 2
1 cel con telecamera pronto al momento giusto!! ;-) La storia riguarda un cliente che comprando delle valvole di finale rispose al nostro avvertimento che avrebbe dovuto biassarle:"IL BIAS NON ESISTE, ho cambiato le finali + di una volta così senza fare altro e non è mai successo nulla"....fino ad ora... ;-) E' poi tornato lamentando "un rumorino"! altro che rumorino! Ciò che "non esiste" gli ha fatto un bello scherzo! valvole andate e ampli andato...ora è l'ampli che non esiste + !
Dragooncabs 3 years ago
porca puttanazza ,fulmini sottovetro ! :)
JeezoozeChrysler 3 years ago 2