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Bias Adjustment point
Bias Adjustment point
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Old 3rd July 2010, 04:21 PM   #1
LarryRup is offline LarryRup
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Join Date: Jul 2010
Default Bias Adjustment point

Hi all: Have a 100b yaquin KT88 Intergrated Amp. Decided to check bias after a year of use. Purchased a biasing tool for this. The first KT88 would not get a reading. The amp has a adjustment point for each tube accesible right from the top of the chassie.

Any turning of the adjust point would not provide any reading on the multimeter. I then fryed that tube! I have now a quad of new tubes and the first one still does not read bias nor allow adjustment. The other three tube bias and adjust fine.

Any idea what the problem is? How to fix it? Whats the risk of leaving like this. Sound is fine. Appreciate any help.

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Old 3rd July 2010, 07:03 PM   #2
Miles Prower is offline Miles Prower  United States
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Join Date: May 2005
Location: USA
Looks like a bad connection between the KT88 cathode and the test point. Definitely get that fixed before you poof another KT88.
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