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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Re: Biasing a Scott 299 posted by 33 1/3 on April 13, 2007 at 19:29:51:
Larry
There is a quick accurate way to set the Dc balance and what you do is get the amp fully warmed up and then put your dc voltmeter across the grid of each output tube of each channel..For intance take your meter and put it across the grids of the left channel tubes and set it for zero volts potential between the two tube's grids..This way if one tube draws more cuurent than the other,the DC balance pot proportionates enough voltage to each grid so it ultimantely draws the same amount of current..Then you can bring up your bias to -18to 21 is where I usually end up and I have seen some at -12 but thats usually when the tubes are real weak.Do the same procedure for the other channel..You have to go over it a few times once in a while.
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Follow Ups
- Re: Biasing a Scott 299 - Michael Samra 02:15:25 04/14/07 (1)
- Re: Biasing a Scott 299 - 33 1/3 10:12:50 04/14/07 (0)
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