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jimscoper · 19th Jun 2020, 11:22 am

I have one of these and it works pretty well - but.

Power supply is a 6 volt transformer feeding up the power cable to the normal internal transformer, a previous owner has fitted diodes to derive the HT. The vibrator is present but not used in this mode.

This works all right but hums. Previous owner has fitted extra choke/electrolytics presumably in an attempt to control the hum.

Any advice, either to attempt to keep the existing 50Hz transformer and try harder to control the hum or to go back to 24 volts DC and the vibrator (or an electronic vibrator).

I did think of a 110Hz 6.3 volt supply but that feels like the wrong way to go.

19th Jun 2020, 11:22 am	#1
jimscoper Triode Join Date: Jun 2020 Location: Yalding, Maidstone, Kent, UK. Posts: 35	R210 Larkspur receiver power supply I have one of these and it works pretty well - but. Power supply is a 6 volt transformer feeding up the power cable to the normal internal transformer, a previous owner has fitted diodes to derive the HT. The vibrator is present but not used in this mode. This works all right but hums. Previous owner has fitted extra choke/electrolytics presumably in an attempt to control the hum. Any advice, either to attempt to keep the existing 50Hz transformer and try harder to control the hum or to go back to 24 volts DC and the vibrator (or an electronic vibrator). I did think of a 110Hz 6.3 volt supply but that feels like the wrong way to go.