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

door Goldline , Oranjedorp, 19.06.2018, 23:57 (2131 dagen geleden) @ ruudtx

4th grid cap or kathode cap ?
try to bridge these with a other cap. observing the anode with the oscilloscoop.

please disconnect top grid and ground it ,to see of the oscilation at 452 stops.
i suppose that you already have removed the 1th stage tube (rf amplifier)?
so this one will not disturb everything.

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Cees PA1DBA