I'm still in trouble with hum in DIY preamp (previous thread is here: http://music-electronics-forum.com/t17650/).
I found that hum goes totally away when feeding the preamp with an external PS. So I believe it depends on inside PS.
Components bypassed by the external PS are: two back-to-back salvaged transformers and a voltage doubler (with 33uf caps).
Can be a transformer be bad and noisy? Should I try different filter caps first?
Thanks in advance.
I found that hum goes totally away when feeding the preamp with an external PS. So I believe it depends on inside PS.
Components bypassed by the external PS are: two back-to-back salvaged transformers and a voltage doubler (with 33uf caps).
Can be a transformer be bad and noisy? Should I try different filter caps first?
Thanks in advance.
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