10-26-2019, 10:39 PM
All the covers have to be on the vibrator section and the radio bottom plate if it uses one. If using a line powered supply the chassis must be earth grounded as short as possible. Vibrator must be in good condition. If the vibrator has been opened and the contact blades bent, the vibration frequency may be off. Should be 115hz.
The buffer cap must be replaced with exact values and type "buffer", no subs of "yellowy" metalized will work in the power supply the metalizing will get blown away because of the spikes. No matter even if using 2.5 kv, the dv/dt is not there unless it is a buffer cap...
If it still buzzes. To prove source is vibrator supply substitute another B+ DC source, an adjustable supply of 80-100 mills, 145 volts. The radio still buzzes look for grounding and/or miss wiring in the RF/IF section...
GL
Chas
The buffer cap must be replaced with exact values and type "buffer", no subs of "yellowy" metalized will work in the power supply the metalizing will get blown away because of the spikes. No matter even if using 2.5 kv, the dv/dt is not there unless it is a buffer cap...
If it still buzzes. To prove source is vibrator supply substitute another B+ DC source, an adjustable supply of 80-100 mills, 145 volts. The radio still buzzes look for grounding and/or miss wiring in the RF/IF section...
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
