New Pre amp thingy

[Richard]

Originally Posted by bob orbell

Colin, the WD PSU III, is designed to provide about 5mA to phono and about 15mA to the pre, your new pre thingy, is obviously consuming more, you will need to reduce the value of R4, if you have taken the supply from pre output, the PSU will supply about 50mA. Instead of loosing power to resistors, regulated power supply's are supreme, that is why I have gone that route. Bob

Hi Bob, Col,

If I've calc'd it correctly, PSU3 should be fine for HT current,

Phono2/3 consumes 4.3mA and Pre3 consumes 23mA

The new pre consumes 10.6mA

PSU is set for 250V as standard so Col may need to add line resistance for 180V.