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Argus25 · 28th May 2018, 4:33 am

The AC vertical deflection voltages on the two anodes of the 12SN7, should be about equal in amplitude an opposite in phase (polarity) and will probably each be in the range of 300 to 400V peak to peak. Try another 12SN7 or swap it with the 12SN7 in the H output stage as a test.

28th May 2018, 4:33 am	#34
Argus25 No Longer a Member Join Date: Oct 2016 Location: Maroochydore, Queensland, Australia. Posts: 2,679	Re: Firestone 13G3 Television The AC vertical deflection voltages on the two anodes of the 12SN7, should be about equal in amplitude an opposite in phase (polarity) and will probably each be in the range of 300 to 400V peak to peak. Try another 12SN7 or swap it with the 12SN7 in the H output stage as a test.