Troubleshoot Phillips 483x at converter stage (ech4 tube) (Techniek Radio/TV)

door ruudtx , 21.06.2018, 17:19 (2352 dagen geleden) @ Radiosterk

This 1.25 signal is generated by the triode (ECH4)?
If so, try to disable the oscillator by disconnecting anode triode from supply.

There is alo a possibility that the front stage is oscillating at the tuned frequency, this will also result in a blank 452 signal. So try to disable this as well by removing tube. Is there still a 452 signal?