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Old 2nd March 2010, 05:30 AM   #11
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This can happen on these amps if the bias isn't set correctly. Clamp everything down before attempting to adjust the bias current.
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Old 2nd March 2010, 05:40 AM   #12
spooney is offline spooney  United States
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Something weird is going on. The bias appears to be unaffected when i turn the pot up. I can crank it all the way up and it does nothing
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Old 2nd March 2010, 05:48 AM   #13
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Does the bias control work properly on the other channel?

If so, you may have a defective transistor (or, more likely, multiple defective transistors) in the drive and/or protection circuit. You may have to check every transistor in the channel. You can't simply check for shorted transistors. Many times, the transistors open so you have to confirm that every bipolar driver transistor has two intact junctions.
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Old 2nd March 2010, 05:54 AM   #14
spooney is offline spooney  United States
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Yes the bias control works properly on the channel I repaired. I will start checking those transistors when I tear back into it tomorrow. Thanks Perry.
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Old 2nd March 2010, 06:20 AM   #15
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In the defective channel, did you find any blown outputs or open source resistors?
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Old 2nd March 2010, 03:01 PM   #16
spooney is offline spooney  United States
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The channel that i've already done the repair on did have shorted outputs but no open source resistors. The channel that has the distortion i did not find any shorted/ blown outputs in but i have not checked the source resistors yet.
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Old 4th March 2010, 07:19 PM   #17
spooney is offline spooney  United States
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I replaced every small transistor in the distorted channel. I checked all of the ones I replaced and didn't find any to be defective but at that point having them all removed and having extras on hand I put in all new ones anyway. I either missed one or there was some bad solder contacts because the amp now has clean output on both channels however the previously distorted channel still has less output than the one I replaced the outputs in. It seems as if one of the opamps may be putting out slightly less signal than the other but I will have to look deeper into that later. If you happen to read this , is there a schematic for this amp in your tutorial Perry?

Last edited by spooney; 4th March 2010 at 07:21 PM.
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Old 4th March 2010, 07:39 PM   #18
spooney is offline spooney  United States
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also wanted to add that the bias pot works properly now
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Old 5th March 2010, 12:25 AM   #19
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Are both gain controls set the same (maximum) position?

If so, the pots may not be properly aligned. Sometimes the shaft gets pulled out slightly and one gets turned before the shaft is pushed back into place. Make sure that both have the same range of rotation. If they're not properly aligned, the range of rotation for one will be less than the other.
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Old 5th March 2010, 02:15 AM   #20
spooney is offline spooney  United States
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Thats exactly what it was Perry. Equal power and clean sound out of both channels now. Thanks yet again.
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