Re: Vintage Radio and Phonograph cutter schematic
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Re: Vintage Radio and Phonograph cutter schematic
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I think is 100Hz hum. Now I did change the 8A cap also. Now the filter and reservoir cap is the same. Made a small rail for that as It was easier to tie several leads to the rain instead of directly to the cap. Now, volume down no hum. Volume up massive 100Hz hum. I think these capacitors I have are not suitable for this. Shame I only have 275VDC and 350VDC rated one and not 450V. Would need to order a proper filter and reservoir cap.... |
Re: Vintage Radio and Phonograph cutter schematic
No hum with the volume control turned down and massive hum with volume turned up suggests 50Hz hum, sometimes caused by a screened lead that has lost it's ground connection or a control grid that's floating, ie: no or extremely high resistance to ground, other causes could be heater/cathode leakage in a valve.
Hum problems can be difficult to diagnose via the internet.....Is the hum level the same on Radio and Pickup? Lawrence. |
Re: Vintage Radio and Phonograph cutter schematic
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Until that will arrive can not do anything further sadly. I thank you so much for your help Lawrence. I am learning so much from you here seriously, I owe you one. Have a great weekend and will post here again when the cap's are her. Ordering from hificollective UK proper filter cap's. and forgot to answer your question, hum level is the same except the external speaker position on the switch. |
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