Making M7 Preamp

[jerrylong]

The balance and volume control circuit

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[jerrylong]

Connected each GNDs of refunding coupling PCB to the cathode PCB, I used diffefrent colors for each stage.

and connected the GND from input RCA to the case with 100R and 3n3 cap

 

[jerrylong]

The balance pot and volume pot have been connected to this PCB

 

[jerrylong]

The amp case has finished connecting wire, in order to avoid noise the power supply wires going through left and the signal wire going through right

 

[jerrylong]

Adding a VR for the balance of filament power supply

 

[jerrylong]

This peramp is finished

 

[jerrylong]

The background noise is 0.06mv(left) and 0.07mv(right), quite a good circuit design

 

[tonescout]

This is the case I used for this preamp



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what a fantastic case, where did you get this from?

Thanks,

 

[euro21]

Google:
Swiss style luxury with table head precision all aluminum chassis BZ3208A pumpkin DAC front ear chassis

 

[tonescout]

thanks - that's great