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FERNSEH · 26th Aug 2017, 11:34 pm

The circuit diagram of the frame timebase. The sawtooth waveform is developed across C50 and is negative going so a leak in C52 would tend to over bias V17.
The frame linearity feed back capacitor should be checked or replaced. It is marked as C57 in the circuit diagram shown in post #36 and as C58 in the official GEC BT2147 and BT5144 circuit diagram.
DFWB.

26th Aug 2017, 11:34 pm	#41
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: And the next one! a GEC BT2147 The circuit diagram of the frame timebase. The sawtooth waveform is developed across C50 and is negative going so a leak in C52 would tend to over bias V17. The frame linearity feed back capacitor should be checked or replaced. It is marked as C57 in the circuit diagram shown in post #36 and as C58 in the official GEC BT2147 and BT5144 circuit diagram. DFWB. Attached Thumbnails Last edited by FERNSEH; 26th Aug 2017 at 11:42 pm.