Name: Steve Kennedy
Email: steve@pacair.com
Subject: Biasing HD 130
Thread: 46
Time: Sat, 12 Jan 2002 22:29:02 UTC
Where was my head (or my typing) that day I replied to your biasing question.
I just noticed that the reply I left you said that 25-30mA of bias current (combined total for two output tubes on an HD130) through a 3.9 ohm resistor gives you 10mV voltage drop.
It SHOULD have said 100mV, not 10mV.
If you follow my original message to the letter you wind up with about 2.5mA of combined bias current, or about 1.25mA per tube!
I don't think that would work very well! At least they would run cool! It just goes to show you that you should take other people's examples and work them out for yourself to make sure they haven't made a dumb mistake like I did!
Sorry about the typo...
Steve