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Old 26th June 2009, 04:24 PM   #1
tim614 is offline tim614  United States
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Question RH84 bias change whith different el84 is use

My RH84 bias (cathode bias) was dial in at 11.6 plate disipation with a pair of JJ but when
i bought a new pair of TAD el84 to try out now my bias is way up at 12.55watts plate disipation.
can some one explain why its doing that?
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Old 26th June 2009, 10:23 PM   #2
bigwill is offline bigwill  United Kingdom
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All tubes have slightly different parameters, that also drift with their age. This is why a lot of amplifiers have bias adjustments.
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