Hagerman Audio Labs TRUMPET REFERENCE, Руководство пользователя

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TRUMPET REFERENCE Vacuum Tube Phonostage 5
Commentary
The Trumpet Reference responds admirably to tube rolling. New old stock (NOS)
tubes are generally the best, offering various sonic improvements, with the final
result becoming a matter of personal taste. Try to match in left/right pairs, to
maintain equalization frequency balance. 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, the tubes are in order: 12AX7, 12AX7, 12AU7,
12AU7.
Cartridge loading depends on the length and type of interconnects used and it is
always good to start with a value close to the manufacturer’s recommendation.
Generally, loading provided by the Trumpet Reference is effectively lower than the
equivalent from a transformer. That is, if you like the sound from 100 ohm
transformer loading (into the MM input), then try the 131 ohm setting on the MC
input. In the end, do not worry about numbers. Adjust to what your ears prefer.
As far as gain selection, it is better to go with lower gain if possible. This optimizes
overall headroom and distortion of the audio system.
The EQ settings provide various curves for achieving better sound from your vinyl
playback. The 3
rd
LED from the left is RIAA (modern) as will be used most often. The
Decca and Columbia curves help with some older microgroove LPs. Again, this is
adjusted for personal preference, and was never an exact science. Nevertheless, this
can make a significant improvement for certain instruments such as violin and on
vocals.