What power supply would I need for this John Linsley Hood Phono Pre-Amp?

[hbanko]

Hi Guys,

I found this "remake" of an old 70ties classic on PCB Way of an John Lindsay Hood 1450:

https://www.pcbway.com/project/shar..._Preamplifier__MC_MM___Turntable_Stylus_.html

Ordered the PCBs and parts. But I actually have no clue what kind of power has to go in. The original used a +14 / -14V power supply. Here I can see a rectifier on the board...

Can anyone help here?

 

[ejp]

I can see two regulators. Find out what they are. That will tell you.

 

[hbanko]

Well they are L7905CV - 5 Volt regulators. So it needs a +5V DC power supply?

 

[EC8010]

No, it needs a centre-tapped AC supply, probably 9-0-9V. Maybe more. The voltage rating of the electrolytics close to the regulators will be a guide. And it's only an MC-MM amplifier. It doesn't do RIAA equalisation. Or pitch control.

 

[hbanko]

Thanks, that helps me. Would have thought that the big resistor bank is for RIAA equalisation?

 

[Mark Tillotson]

There are three resistors per transistor, probably biasing for them.

 

[ejp]

Would have thought that the big resistor bank is for RIAA equalisation?

You can't do that just with resistors. You only need two per channel for that anyway.

It doesn't do RIAA equalisation.

It does, but not on that schematic, which is incomplete.

Or pitch control.

Not on that schematic, and not explained anywhere else.