[allybags]

As a pensioner on limited income I wondered if before dumping the above item if you or anyone you know can help me repair the above valve oscilloscope.

The problem is no 'X' drive scan so the spot is stationary and not the horizontal line you would expect, and my knowledge of valve circuitry is limited. The problem seems to be around the V7A & B of ECC83 'X' drive which performs the 'X' shift and Sweep Drive. Smoke starts to appear around the grid resistor R70 which is 470 ohm quite quickly! I have changed the valve with no improvement. I have also plodded round with a volt meter and although the anode HT's on both is around 240v, the other voltages on the cathodes are at variance with what the circuit diagram says. I therefore need to talk it through with someone who understands valve circuitry as I'm sure you do. Any help gratefully received.

PS I have attached the circuit diagram, page 15/16 refer