1950s Philips Radio Issues

[vortalexfan]

Greetings Everyone, I'm currently working on a 1950s Philips Model B6X15A/70 AM/SW HiFi radio that seems to have some weird issues.

Issue #1 that this radio is having problems with is extremely scratchy tuning in all tuning bands, which I thought it was because of dirt and dust trapped in the tuning condenser but when I cleaned it out it was still scratchy sounding when you tuned through the various tuning bands.

Issue #2 that this radio is having problems with was that when I got this radio the tuner was dead silent when I got it and it was dead silent in all of the different tuning bands, so I went and tested all of the tubes and all of the tubes tested fine except for the EBF89 tube which tested shorted in all 3 sections of the tube, so I had ordered a new EBF89 over at AES, and I installed that tube and the Radio worked great for about 5 minutes and then it went dead again.

I looked at the undercarriage of the radio to see what kinds of caps there were underneath and there weren't any paper caps underneath they were mylar (or some similar material) capacitors that don't fail as easily as the old paper caps that we used to use here for many years did, the filter caps are still good on this thing yet, which is what's throwing me for a loop as to why the EBF89 tube would be failing like it did.

Any ideas as to what might be going on with this radio?

Thanks.