In the circuit there is an elevation of filaments!
It is not bias
Walter
You are absolutely right, I am confused.
I don't know what I'm going to do with this thing anymore
The buzz could be because of the way the chassis/box is connected to ground ... how you did it ?
The buzz could be because of the way the chassis/box is connected to ground ... how you did it ?
Hello, the GNDs are all centralized in the same point located in the RCA connectors and these ground comes from the preamps through the house- gnd that I have attached.
Attachments
Finally locate the noise, it was coming from the step - up transformer, it has internal problems with the cable shielding, I will have to replace them.
try this
run fine
Also with 9 volt battery
Walter
Thank you very much Waltube,
I will try according to your scheme,
One question, is the grid configuration of my 6c45p correct?
Whic is the actual scematic you have?
This is the original
Attachments
The connection is fine.
The Ia of 6C45 is 8 mA
The Vk is around 5 volt
Have you done some measurement on gain and Thd?
The impedance of the output stage is not so low also for a non bypass on 5751.
The output cap is also too low in case a standard input line stage.
Which is the Z in of the line stage?
Walter
The Ia of 6C45 is 8 mA
The Vk is around 5 volt
Have you done some measurement on gain and Thd?
The impedance of the output stage is not so low also for a non bypass on 5751.
The output cap is also too low in case a standard input line stage.
Which is the Z in of the line stage?
Walter
Last edited:
The connection is fine.
The Ia of 6C45 is 8 mA
The Vk is around 5 volt
Have you done some measurement on gain and Thd? I have no means to measure THD
The impedance of the output stage is not so low also for a non bypass on 5751.
The output cap is also too low in case a standard input line stage.
Which is the Z in of the line stage? Around 12K
Walter
Ist this 10 nF/1 M RC coupling to the 2nd SRPP with a LF rolloff of just 16 Hz intended as an anti rumble filter?
Sorry if this question has been made and answered yet. I didn't read t5he whole thread 🙄.
Best regards!
Sorry if this question has been made and answered yet. I didn't read t5he whole thread 🙄.
Best regards!
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