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 Post subject: 6505+ bias adjustment
PostPosted: Sun, Jul 25, 2010 6:50pm 
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Plank Cranker Wanker

Joined: Tue, May 11, 2010 7:18pm
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i know the original 5150/6505 doesnt have a bias adjustment on it, and people mod that for having one. i know the II/+ models have a bias adjustment but the window of adjustment is very very small. what needs to be done on the 5150II/6505+ in order to get that window to open up ?? a different pot with more adjustability, or does a resistor need to be changed ??

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PostPosted: Sun, Jul 25, 2010 7:15pm 
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Rock God
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the 6505+ needs a bias mod to be adjusted, unless they changed the design in recent years. :confused:


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PostPosted: Sun, Jul 25, 2010 7:34pm 
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Plank Cranker Wanker

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Location: corpus christi, tx
mine has a bias adjustment ... it is factory. only the original 5150/6505 models didnt come with a bias adjustment from what i understand. the only thing is that the adjustment i do have isnt much. the sweep is very small, and i need a little more adjustment as even when pegged the tubes are still set very cold ...

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PostPosted: Sun, Jul 25, 2010 8:08pm 
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Plank Cranker Wanker

Joined: Sun, Nov 01, 2009 6:29pm
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Location: CT USA
yeah its just a resistor that allows more adjustablity, easy to swap just use that google thing and youll find it...


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PostPosted: Mon, Jul 26, 2010 12:11pm 
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Supah Stah
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Joined: Mon, Nov 19, 2007 5:40pm
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MYLILSS wrote:
mine has a bias adjustment ... it is factory. only the original 5150/6505 models didnt come with a bias adjustment from what i understand. the only thing is that the adjustment i do have isnt much. the sweep is very small, and i need a little more adjustment as even when pegged the tubes are still set very cold ...
I've heard the 6505+ bias trim pot has a small sweep, but the one on my JSX makes a noticable difference in power amp tone and performance :confused:
Maybe it's because I'm running EL34's and the 6505+ is 6L6's, so there is more headroom to deal with....

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