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39 55 aliginment
AI2V
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Posts: 201
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Joined: Dec 2005
City: Morris Plains, NJ
#2

05-25-2007, 11:46 AM
Both the 78 and the 6J8 have grid caps on the top of tube- there is no need to remove the tube to inject a signal. Try using the lead of a .05mfd cap wrapped around the tube grid post and the other end of the cap to the sig gen. The value of the cap isn't critical but .01- to .05mfd is a good range. It's a good practice to leave the actual grid clip disconnected when injecting a signal.
Pete AI2V
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39 55 aliginment - by Guest - 05-25-2007, 02:07 AM
78, 6J8 Grid connections - by AI2V - 05-25-2007, 11:46 AM
[No subject] - by Guest - 05-26-2007, 12:56 AM



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