Mετρήσεις Single-Ended και ο John Atkinson...

[Κώστας Φ.]

Πολύ γέλιο...
Δοκιμάζει ο Art Dudley τον παρακάτω ενισχυτή:

Mastersound 300 B S.E. integrated amplifier

• Description: Tubed integrated amplifier with single-ended, class-A output stage and four line-level inputs.
• Tube complement (two each): 300B, ECC82, 5687 WB.
• Input impedance: 100k ohms.
• Frequency response: 8Hz–30kHz, ±0dB.
• Output impedance: 4 or 8 ohms (selectable).
• Maximum output power: 12Wpc (10.8dBW).
• Price: $6095.

....και στο συμπέρασμά του αναφέρει:

It's among the highest-fidelity SET amps I've used, yet it filled that role without sacrificing all the good qualities that often seem to come from a different direction altogether—such as flow and momentum and the ability to sound human rather than mechanical.

The 300 B S.E. offers acceptable value for the money, especially to the hobbyist who already has a warmish-sounding system and wants the benefits of a single-ended triode without adding more color. It would be a fine thing to install once and enjoy, tweakless and serene. Recommended.

Το βάζει λοιπόν το μηχανάκι ο John (o Atkinson) στον πάγκο και αρχίζει να μετράει από δω, να μετράει από εκεί, απελπίζεται (τις μετρήσεις του ενισχυτή θα τις βρείτε εδώ)....και καταλήγει:

Its output transformers are well engineered, but the Mastersound 300 B S.E.'s measured performance can't escape its single-ended provenance: both its response variations and its level of distortion are large enough to have audible consequences. You get the lowest level of distortion from its 4 ohm tap, but the smoothest ultrasonic rolloff from its 8 ohm tap. And neither tap works too well with impedances below its nominal value.

The question is therefore begged: Did AD like the amplifier because of what it did right despite what it did wrong, or because of what it did wrong? I have to say that I have no idea.

Διαβάστε το review εδώ: Stereophile.com