Hagerman Audio TRUMPET, Руководство пользователя

Страница: 4 / 8

TRUMPET Vacuum Tube MM Phonostage 4
Operation
The Trumpet installs between your turntable and linestage. Be sure to connect the
ground lead to the grounding lug near the inputs.
Do NOT operate unit without tubes installed. Connect the power cord to a 120Vac
source. Turn on the Heater switch and wait for 30 to 60 seconds. Then turn on the
high voltage. The indicator lamp will turn green. The Trumpet requires about 30
minutes to warm up and sound its best, which is typical of high quality tube
equipment. Set both Mute/Polarity switches to the right (or left for inverted signal).
Center position is mute.
Tube Rolling
The Trumpet responds admirably to tube rolling. New old stock (NOS) tubes are
generally the best, offering various sonic improvements. Different tubes sound
differently, and the final result becomes a matter of personal taste.
Always replace tubes with their equivalents! Do not use, for example, a 12AT7 in one
of the 12AX7 locations. Starting from the rear of the unit (near RCA jacks), the tubes
are in order: 12AX7, 12AX7, 12AU7, and 12AU7. It is best to use matched tubes in
matched left-right pairs.