Re: Telequipment S51 - No horizontal sweep
Can you check to see if there is a short to HT via the remotely located 'X gain' RV10 control? Something is putting 200V on V7 cathodes whilst the valve appears to be non-conducting.
Disconnecting the wires to the' X gain' control from the pcb points 41 and 42 and then re-checking the cathode volts would be one way to isolate the control and see if it is affecting the problem.
Ron
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