UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

boiss · 17th Oct 2006, 7:25 pm

I've got a little battery valve portable set which uses the DF-DL etc series (4 valves ), but it appears to be a little deaf. There are no strong MW/LW stations here so it's difficult to judge the sensitivity. How much hiss or background noise should there be when it is not tuned to a station? At the moment there is virtually nothing from it when it is not tuned to a station. It has a 60V ht. Everything appears ok, some of the resistors have a slightly higher value than than the markings but not more than about 20% higher so they are virtually within tollerance. Voltages around the circuit seem reasonably correct.
Regards,
Mike.

17th Oct 2006, 7:25 pm	#1
boiss Pentode Join Date: Jun 2006 Location: Malaga, Spain. Posts: 235	'Deaf' Battery Valve portables I've got a little battery valve portable set which uses the DF-DL etc series (4 valves ), but it appears to be a little deaf. There are no strong MW/LW stations here so it's difficult to judge the sensitivity. How much hiss or background noise should there be when it is not tuned to a station? At the moment there is virtually nothing from it when it is not tuned to a station. It has a 60V ht. Everything appears ok, some of the resistors have a slightly higher value than than the markings but not more than about 20% higher so they are virtually within tollerance. Voltages around the circuit seem reasonably correct. Regards, Mike.