Analog Metric 2A3 Manual do Utilizador descarregar pdf (Página 7)

[300B SE Valve Amplifier Kit] Analog Metric

www.analogmetric.com

7. The tube filaments grow up gradually when turn on the power supply. Turn off the

power supply if there is a suddenly dropping in the supply voltage at P1, H1, and H2,

or HL, or any audible hum from power transformer and double check all components

and connections.

8. Adjust the cathode current Ic by the resistor trimmer VR1 and VR1B as in Figure 3.

Measure the voltage V1 and V2 across R6 and R6B, respectively, so that Ic = V1/R6

= V2/R6B is set.

Figure 3: Adjusting the cathode current by resistor trimmer VR1 and VR1B.

9. Connect the output transformer with 2.5k/3.5kΏ primary impedance (120mA) to the

ROUT and LOUT of the board.

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Analog Metric 2A3 Manual do Utilizador Página 7