D.W. Fearn VT-1 Instructions d'exploitation télécharger pdf (Page 5)

D.W. FEARN

VT-1 &

VT-2 Microphone Preamplifers

VT-1 / VT-2 Vacuum Tube Microphone Preamplifier

Final Test Report

Model _______________ Serial Number_______________Mains Voltage ______________

Date ___________________ Tested by ________ VU

Calibrated to _______________ dBm

Test Equipment ____________________________ Microphone ________________________

Channel A

Frequency Response:

20 cps to 20 kc/s +/- ___________ dB

THD+Noise:

20 cps ______________ %

200 cps _____________ %

2 kc/s _______________ %

20 kc/s ______________

Noise:

______________ dB below +4 dBm out

Equivalent Input Noise _______ dB

Operational Tests:

-20 pad ________________

Lo-Z input ______________

Phase Reverse __________

+48V ___________________

Listening Test ____________

Channel b