[matspar]

Good evening all. I am restoring this nice little Ekco set and have reached the point where I am stuck and could do with some advice.

After all the usual checks and some replacement caps and resistors in the power supply she was successfully powered up and displayed a very good raster. The front end was totally deaf and I spent some time correcting this and was making good progress.
I powered the set up the next day and was greeted by the unusual fault condition of line collapse. Eht heavily damped and reading only 2kv. Having read some of John W's previous write ups I initially pounced on C28 & C29 (100pf) mica caps in the line oscillator, but with no improvements.

I have been through the line timebase countless times and haven't yet traced the fault. All the relevant waxies have been sustituted and all resistors within tolerance. The correct line drive waveform appears to be present on the R36 side of C30 and reading - 40v. The line scan coils are intact and showing an acceptable resistance reading.
I have replaced V7 (SP61) line oscillator) and V10 (PY31) boost diode with no change. I don't have another line output valve V8 (6P28) to try.
Cold checks on the oil filled lopt have revealed nothing amiss, and I've read that this type is very reliable.

What am I missing?! is the 6P28 a likely culprit here?
+30v is present on the top cap (grid) of V7. The Trader sheet suggests there should be a negative voltage present here. With a signal applied the scan opens to around one inch wide. HT and all other voltages appear correct (so far)

Any thoughts would be most welcome!!