Board size:  153mm*113mm*32mm  (W*L*H)

Installation opening holes distance is 141.224mm*100.584mm.

This Power supply circuit is base from the conrad-johnson preamp power supply part. so we are not have the schematic for it.

The board default seting as following:

High voltage: DC280V    (  high voltage can be adjust between 180-350V. )

Filament Voltage:  about DC6.3V  ( it can be adjust between 1.5V-12.6V)

High and low voltage start-ups are slowly superimposed, that is, soft start, so that the impact on the gallbladder is less.


Note:
1: Especially for the novice to explain, this high voltage AC input is need add a transformer, can not directly input the city main power 110V or 220V! ! ! !

2. From the regulation performance and power consumption heat, we must control the voltage difference (20V or so is ideal): for DC250V input AC200V is good , For DC280V , AC230 is good, for DC300V , AC260 is good.
 (Calculation formula：input AC*1.4-output DC=20-50mV）

3. The Main capacitor of this board is 400V voltage. Please note that the input voltage should be controlled below AC280V.



On this board the LM317K are used. it is 100% origianl and works in good performance.