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10-10-2008, 03:35 PM
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#1 (permalink) |
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Senior Member
Join Date: Aug 2008
Location: WashingTone
Posts: 108
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Your bias number for your DSL...
I'm curious to see where you guys are biasing your DSL100's/50's. I've got Tung Sol EL34B's in my DSL50 and have been messing around with some cooler biases. Right now I've got it set at 33mv. Looks like I'm running mine in the 60% range according to a Jim Jones Bias table located on Weber's site.
Bias chart for EL34's 25 watts disipation. EL34 - 25W Hot (70%) Avg (60%) Cool (50%) 300V 58mA 50mA 42mA 325V 54mA 46mA 38mA 350V 50mA 43mA 36mA 375V 47mA 40mA 33mA 400V 44mA 38mA 31mA 425V 41mA 35mA 29mA 450V 39mA 33mA 28mA 475V 37mA 32mA 26mA 500V 35mA 30mA 25mA
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DSL50 - Voodoo modded  Fender Tele GT HH coil split 212 G12K-100/V30 Pedals just for the Marshall: Bad Monkey Boosta Grande Wah Aphex Xciter in loop Delay in loop  
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10-10-2008, 07:53 PM
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#3 (permalink) |
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Junior Member
Join Date: Oct 2008
Location: Bulgaria
Posts: 21
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Re: Your bias number for your DSL...
I am absolutely agree with the chart for hot tube EL 34 in 450V power supply-as mush as it is approximately in DSL-50.Bias should be arround 39 mA-my DSL-50 is 40mA.
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www.myspace.com/metalhit |
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10-10-2008, 08:08 PM
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#4 (permalink) |
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Senior Member
Join Date: Aug 2008
Location: WashingTone
Posts: 108
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Re: Your bias number for your DSL...
Yah the reason I did this was to see if others found their amps sound better at lower bias than Marshall's 45mv which I think is too hot. Also curious just to see where you are at and how you like it. Keep em' coming.
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DSL50 - Voodoo modded Fender Tele GT HH coil split 212 G12K-100/V30 Pedals just for the Marshall: Bad Monkey Boosta Grande Wah Aphex Xciter in loop Delay in loop
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10-11-2008, 10:34 AM
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#5 (permalink) |
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Junior Member
Join Date: Oct 2008
Location: Bulgaria
Posts: 21
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Re: Your bias number for your DSL...
Well that is very individuall and very discussed.Everyone is aming to find the most appropriate for himself sound.
When I bought my DSL-50-brand new from the music shop-bias was about 41,5mA(or mV in bias socket).If you set it's level too low you have a loss in the out power-but the sound is a little bit softer(accordnig to me).Some people like exactly that. I have an amp with EL34 and power supply-450V which I have biased on 35mA-but it is not a Marshall. Sometimes happens a misunderstandig e.g.-one JCM800 -50W which has a power supply about 380V - clearly needs a higher bias. You can try to rebias it to about 40 mA and to bring it back to 33mA to hear the difference in the sound and to decide for yourself-what exactly do you want and how you like it. Regards! 
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www.myspace.com/metalhit |
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10-11-2008, 11:21 AM
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#6 (permalink) |
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Senior Member
Join Date: Aug 2008
Location: WashingTone
Posts: 108
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Re: Your bias number for your DSL...
Right now I am running a 34mv bias at 470 plate voltage. I finally checked actual plate voltage. It sounds pretty good and I really don't hear it running thin. 70% which is considered hot my bias number works out to be 37mv. 60% my bias number is 31/32.
I hear mine get flabby and mushy at 45mv where Marshall recomends. Looks like Marshall is using 380 plate voltage to get that 45mv bias number. Nowhere near my actual plate voltage of 470v. Are any of you guys checking where your plate voltage is or just using around the the zone of what these amps run at which is suppose to be 450v to 500v.
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DSL50 - Voodoo modded Fender Tele GT HH coil split 212 G12K-100/V30 Pedals just for the Marshall: Bad Monkey Boosta Grande Wah Aphex Xciter in loop Delay in loop
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