Identifican request - 3 Valve mains superhet

[Sparks]

I just had another look at it. I discovered when I put the meter prod on the anode of the EF39 (IF Amp), it suddenly became stable with excellent tone and volume across the band. Just the meter lead alone has the same effect. Very puzzling. All the components in that area are OK and the valve metalising is intact and connected. The anode V was 96 and also the screen V was 96. I disconnected the screen grid of the EF39 (which shared the dropper and decoupling capacitor with the frequency changer and fitted a separate resistor and capacitor for the IF amp. It did not make the slightest bit of difference. Perfectly stable with a one-foot long wire connected to G2, shrieking and howling without it!
Bob