What's your bias set at?
Moderators: pompeiisneaks, Colossal
What's your bias set at?
When I first fired up my amp I set the bias knob at noon and it ended up being around 25mA. It was okay, so I tried bumping it up to 40mA and it started to sound really stiff. I'm at 36mA currently and think it sounds pretty good.
Where are you guys running your amps?
Where are you guys running your amps?
Re: What's your bias set at?
30mA here. I'll experiment this week.
Allynmey
Allynmey
Re: What's your bias set at?
I set mine using the crossover distortion / scope method and am setting at 32 ma
Re: What's your bias set at?
Wow, that sounds pretty precise! I'll set mine at 32mA as too!UR12 wrote:I set mine using the crossover distortion / scope method and am setting at 32 ma
Re: What's your bias set at?
I used the OT shunt method and set at 33.8mA
Nigel
Nigel
Re: What's your bias set at?
35ma, I haven't been able to play with the setting yet.
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Re: What's your bias set at?
I set my bias pot so I'm reading -30VDC on pin 5. Did the shunt method at this setting and was reading 37 and 38 ma on a matched pair of new Winged C EL-34s.
Plate voltage was 396VDC. Sounds very nice (and LOUD)this way.
Hope that helps.
Plate voltage was 396VDC. Sounds very nice (and LOUD)this way.
Hope that helps.
Re: What's your bias set at?
Hey custom
How do you like those Winged C El34s?
How do you like those Winged C El34s?
Re: What's your bias set at?
hello there, yep i pretty much bias the couple of 2-el34 amps i have (that run at these plate voltages) in the 38-40ma range. a lot of the plexi guys like to use the 70% dissipation point but i like to run them a bit leaner than that, though usually over 50%. i wonder if the guys (allyn and greg i believe) that spent the time with francesca had time to do a plate current check----i do believe they said that the plate voltage was right on target with moose's power trannie. if not, maybe when they get it back they can do a plate current check to add to the list details. rh
Re: What's your bias set at?
I'm sure its just going to vary from one set to the other,depending on brand or hot or cold rated the tube is. But i think the posts show it can be from 30 to 40ma somewhere in that ballpark.
Richie
Richie
- leadfootdriver
- Posts: 421
- Joined: Tue Mar 08, 2011 10:32 pm
Re: What's your bias set at?
Bumping this for perspective..
I always just set to 70%.
However, reading into it, it seems there's an audible difference between 50-70%..
I'll need to try again.
I always just set to 70%.
However, reading into it, it seems there's an audible difference between 50-70%..
I'll need to try again.