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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Thu Dec 05, 2013 8:57 pm 
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Mark II

Joined: Tue Jun 12, 2007 1:35 am
Posts: 135
Charles Reeder wrote:
NO. It absolutely, positively IS NOT HYPE. Bias those power tubes up to 39 to 42ma and the amp goes from sounding like hail bouncing off a tin roof to the big bad wolf trying to climb down your chimney.


Mine sounds like that now.


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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Sat Dec 07, 2013 3:16 pm 
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Mark II

Joined: Tue Oct 08, 2013 2:29 pm
Posts: 61
Yeah as was said...other things will have a bigger effect...different guitar, different speakers....but that doesn't mean that well biased quality tubes do not make an improvement.
And it isn't just subjective and you don't need "and my, what gig ears you have Gramma" to be able to hear and feel the difference. I mean if you don't hear the difference speakers make, you probably wont hear the tube difference either. You wre very fortunate. A Squier Affinity into a Solid State Vox Valvetronix or whatever...will work perfectly and save you THOUSANDS.

Rest assured though that going from cold or improperly biased Sovtek EL34s to a set of vintage Mullards that is biased for the amp, you WILL hear a night and DAY difference. If you don't, I probably wouldn't admit it ;-)

DISCLAIMER: Many Mesa amps/circuits actually sound BETTER with a cold biased and relatively sterile power sections. When dealing with super saturated preamp sections, a clipping power section on top of it can create a nice musshy puddle of MUD!


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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Thu Jun 05, 2014 8:51 am 
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Single Recto

Joined: Tue Oct 25, 2005 7:33 am
Posts: 1902
Location: Alexandria, VA
A proper bias is a must for power tube distortion and like I and others have said, if you do not want to get dirty you can talk to many vendors who will get you in that range with the tubes they send you.

Charles Reeder wrote:
NO. It absolutely, positively IS NOT HYPE. Bias those power tubes up to 39 to 42ma and the amp goes from sounding like hail bouncing off a tin roof to the big bad wolf trying to climb down your chimney.


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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Mon Jun 23, 2014 10:53 pm 
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Mark I

Joined: Sun Sep 11, 2011 2:02 pm
Posts: 33
Why couldn't you run another brand without the bias mod. Wouldn't you just need to match the values to what's already in there?
A simple bias test unit like the one Mojotone sells would do the job. It works by plugging into your tube socket then installing the tube onto of that and you get your readings. Now, using the same tester just match up the values in brand X. What am I missing?


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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Mon Jun 30, 2014 12:10 pm 
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Mark III

Joined: Wed Jan 04, 2012 9:32 pm
Posts: 217
Scott Rolf wrote:
Why couldn't you run another brand without the bias mod. Wouldn't you just need to match the values to what's already in there?
A simple bias test unit like the one Mojotone sells would do the job. It works by plugging into your tube socket then installing the tube onto of that and you get your readings. Now, using the same tester just match up the values in brand X. What am I missing?


You're absolutely right. The thing is, if you're tubes are not in the desired range, there's nothing you can do about it.

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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Fri Jul 11, 2014 9:37 am 
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Single Recto

Joined: Tue Nov 20, 2007 9:58 pm
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Having used THD amps for many years that are very easy to set the bias at different amounts I found in general setting the bias more cold works great if you are cranking up the power amp to louder volumes. Think band or louder. When playing at lower volumes I much prefer the bias set warmer. Think bedroom volumes or a little louder.
This is all a matter of taste and is effected by the other gear I am using and the texture & color I am trying to achieve.

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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Sat Jan 31, 2015 1:03 pm 
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Mark I

Joined: Fri Apr 08, 2011 8:53 pm
Posts: 21
Location: New Jersey
Gordybaby wrote:
I think because of the Internet people spend way too much time playing amps, tubes, speakers, pedals, ect instead of playing guitar. There are plenty of players out there who have thousands of dollars in gear and can't tell their guitars is out of tune. But back to your question. Yes it makes a difference. And you can use any brand tube you want. I did mine myself and it works fine. It makes a subtle change in tone and feel but your money is better spent on speakers and cabinets. That has had the biggest change I have made to my setup as far as basic tone improvement. If you like the way your amp sounds that's what really matters.


Gordy,

what speakers and cabs are you referring to ? im running a couple vertical 2 x 12's with mine any recommendations ?

thanks,

Joe

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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Sun Feb 01, 2015 11:31 am 
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Mark II

Joined: Fri Jun 11, 2010 10:46 am
Posts: 91
My main cab is a stoneage 2x12 C loaded currently with WGS 65s. I also own a matchless 4x12 that has there treated 30 watt celestions speakers in it that sound really good with this amp, but is ungodly heavy and awkward take to shows. I have rotated a pair of Celestion creambacks 65 and greenbacks but I prefer the WGS 65 best.


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 Post subject: Re: Is Bias Mod Hype?
PostPosted: Tue Dec 01, 2015 8:18 am 
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Mark III

Joined: Sat Jul 01, 2006 1:23 pm
Posts: 263
I think the one piece of information that is being glossed over is, 'in Bold, Solid State rectifier mode' the bias could be close to what most would consider good enough, but this changes as soon as you switch to Spongy/tube Rectifiers.

What really needs to be pointed out is the bias resistor values need to adjust as you make these other mode changes.

Getting a bias reading of 40ma for each of the above changes would give you the sounds of vintage amps, and probably the best tones. My guess is the Mesa didn't do the because you could potentially red plate your power tubes by switching back to Bold or diodes and send too much current, causing problems, without having some sophisticated switching being done also, (*doing this manually could be a warranty nightmare).

Actually having the option to run the power section 'hot or cold' would be pretty cool. A hot bias loses some articulation in a band mix. Fast picking, tapping and finger picking stands out better in a band setting with the bias a little colder. The Soldano SLO is a great example, as are the Dual Rectifiers.

My problem is I don't want to take out multiple amps, to the gig, so compromise is the only option. And if you think about it that is the reason channel switchers were developed, to give us variety during a show. A single channel amp that does ONE sound very well will always trump a chance that does 2 or more sounds pretty well. But, most guitarists want Fender Twin or Vox cleans, JCM800/tube-screamer leads and Dual Rec rhythms, in one amp, oh, and with a solo boost too. Well, that's what I want too.

Chasing the Tones in you Head can cause madness, but we all do it.


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