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Skywave · 14th Nov 2015, 12:29 am

Sounds like R.F. instability to me. Given the fault conditions (i.e. not wavelength specific), the I.F. amplifier stage is a strong contender. Have a look inside and see if you can see any 'waxy' capacitors. If there are any, change them. Ditto any capacitors bearing the name 'Hunts'.

Al.

14th Nov 2015, 12:29 am	#2
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: 1931 Marconiphone 42 oscillating problem Sounds like R.F. instability to me. Given the fault conditions (i.e. not wavelength specific), the I.F. amplifier stage is a strong contender. Have a look inside and see if you can see any 'waxy' capacitors. If there are any, change them. Ditto any capacitors bearing the name 'Hunts'. Al.