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Old 28th July 2008, 01:07 PM   #1
JandG is offline JandG  United States
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Default Lab supply for cathode bias experiment question..

Can I use one of my lab PS's for hooking up cathode bias on some siple SE amp experiments. I am using NiMH batteries most of the time, even my Dewalt cordless drill battery from time to time,. Will the trickle charge be a bad thing for useing a adjustable lab supply for this lazy bias experiment, I just want to be able to hear differances & change output tubes on the quick ..I have know problems have many supplies for one amp I do it all the time, no small children around here. no cats etc..If I can this would be great..This would be for mostly the output tubes in SE as I allways have enough batteries for input & driver tubes.
J & G
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Old 14th August 2008, 04:20 AM   #2
rubli is offline rubli  Mexico
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I would not use such batteries batteries to bias your tubes, any discharged battery will ruin your tube, no problem in using a bench PS, rmember the bias is negative, take care in checking that the negative post is not connected to phisical ground...


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Old 14th August 2008, 01:37 PM   #3
JandG is offline JandG  United States
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O.k., so I can just do this w/ lab supply for grid bias only in - & without the Neg post physicaly grounded. NO cathode bias experiments can be done with lab supply..? I suppose not but want to check.. Thanks J & G
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