Measuring B+

L

laneychris

Member
I have a 50 watt Modern Classic I, I need to know what the b+ is so I can set the bias on a fresh duet of Tung-Sol's
 
Black probe on meter to ground. I use chassis bolt holes. Red probe to standby switch. You can also measure directly on the power tube pins and or through the socket.
 
No more than 32ma- I would probably keep it around 28-29, but lots of Rigtalk guys like to set it too hot so the amp doesn't 'breathe' and feels choked.... Plus your tube life is cut considerably,
I guess they like crap tone and $pending $$ for new tubes often!
 
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