Naim NA322 MM phono board

[myxa]

Hello, Tell me the power supply diagram for na 322

 

[vsmusic]

The power supply is a regulator on the LM317 . As it was with NAIM . Standard scheme for 317's

 

[myxa]

Thanks for the advice on the power supply. Tell me how to increase the gain phono board?

 

[myxa]

Thanks for the advice on the power supply.

Tell me how to increase the gain phono board?

 

[vsmusic]

Hello ! The gain can be changed in R6 and R16 values (according to the Jim Salabim scheme)..........When using BC 550/560 transistors, the circuit will generate . You need to add capacitors C9 and C10 - as shown in the photo .

 

[myxa]

Many thanks for the advice

 

[PRR]

Hello ! The gain can be changed in R6 and R16 values (according to the Jim Salabim scheme).......

I think "R16" should be "R19"?

 

[vsmusic]

I specified R16 according to the Jim Salabim scheme at the beginning of the topic .

 

[myxa]

Hello Tell me how to adjust low and high frequencies in the diagram?

 

[jpk73]

When using BC 550/560 transistors, the circuit will generate . You need to add capacitors C9 and C10 - as shown in the photo .

Please explain why! Thanks

 

[vsmusic]

Hello Tell me how to adjust low and high frequencies in the diagram?

Hello !
The frequency correction complies with the RIAA standard . And you don't need to configure anything there . Here is the measurement of the NA-322 board -

 

[vsmusic]

Please explain why! Thanks

Because the BC550 /560 are different from the original ZTX transistors . Without correction capacitors, there can be high frequency generation in the circuit . I had it like that .