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Tubelab Discussion and support of Tubelab products, prototypes and experiments |
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#1 |
diyAudio Member
Join Date: Dec 2019
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Ive been running my tseii for a while now and all has been great. I decided today to check/adjust my bias since it had been a while. I am seeing some odd behavior while trying to set bias on the right channel. Im running just under 400 b+ and b- is showing around -200. I am trying to set current at 75ma. The left channel is nice and stable but the right channel continues to drift after i make an adjustment.
I checked the bias voltage at the 300b and it is around -66v and is stable even when the tube current is fluctuating. My first thought was the tube was the issue but I swapped tubes and the issue stayed on the same channel. What should i be looking at to solve this issue? Thanks for any help |
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#2 |
diyAudio Member
Join Date: Feb 2007
Location: Arkansas
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You might try touching up the solder joints on the resistor you are measuring across; maybe try a different set of test leads or meters to eliminate measurement issues before you suspect the amp.
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#3 |
diyAudio Member
Join Date: Feb 2007
Location: Arkansas
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If it is not a measurement issue, then look for a leaky coupling cap on the side that is acting funky.
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#4 | |
diyAudio Member
Join Date: Dec 2019
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Quote:
Its funny how something so stupid can create an "issue". Thanks for the suggestions |
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