Oh and yes, lot of tubes... 8 in the poweramp and 6 in the preamp... Damn, I'm not gonna use it until december or something, it gets pretty hot here now !
New Toys of Mass Destruction
- Thread starter Brett - K A L I S I A
- Start date
Razorjack
Bass Behemoth
It is very possible that one or more of the preamp tubes in the louder channel has more gain than the ones in the quieter channel. I had that in my Marshall poweramp, I solved it by replacing the preamps with gain-matched ones from Watford Valves.
Hopkins-WitchfinderGeneral
we are children of god
black sugar
The Burninator
Oh, I got it, I got wrong the "louder" and "quieter" channel, thought you were refering to the Clean and Modern, haha I'm so stupid 
So if this is it (this was my initial guess) I think this is no big deal right ? No risk to harm the amp or whatever ?
So if this is it (this was my initial guess) I think this is no big deal right ? No risk to harm the amp or whatever ?
black sugar
The Burninator
Razorjack
Bass Behemoth
Yeah, it doesn't hurt the amp. I only changed my tubes as the poweramp still had the stock tubes in and being 14yrs old they were a bit worn out!!
Okay thanks guys. I hope the problem is that and nothing else. Is there a way to find out ? For example if I switch my tubes (like 1-3 go to 4-6 and so forth), if the problem remains (on the same side) maybe it's another problem. What do you think ? The thing is, if this baby has some default, I'd rather find out now that I just bought it, you know ?
black sugar
The Burninator
If you do a channel to channel tube swap and the problem switches sides, you're fine.
Otherwise it's probaby a resistor or capacitor that's drifted in value, which isn't necessarily a bad thing.
It happens in every amp over time, but it's more noticeable to you since you're looking for the exact same sound out of each channel. You'd be hard pressed to find two same-model amp heads that sound exactly the same, for example.
I'd say it's probably fine, but if you're really worried about it, contact Mesa or take it to a tech.
Otherwise it's probaby a resistor or capacitor that's drifted in value, which isn't necessarily a bad thing.
It happens in every amp over time, but it's more noticeable to you since you're looking for the exact same sound out of each channel. You'd be hard pressed to find two same-model amp heads that sound exactly the same, for example.
I'd say it's probably fine, but if you're really worried about it, contact Mesa or take it to a tech.
kaomao
Member
Brett - K A L I S I A said:
Uh blue glow is just beacuse is a fixed bias amp I think, it's biased very cold as mesa dual rectifier.
Mr Randall Smith as Mr Harvey Peavey (harvey just on 5150 mk1) decided to use that fixed bias that to me it's just a shame, they want you to buy their tubes.
Well the volume difference maybe could be just a poweramp tube that is going to die on the weak channel, if in the next month the amp will start loosing lowend and will have the volume that increases and decreases, dying poweramp tubes will be for sure the problem.
Maurizio
Similar threads
