Tube Power Amp Reviews

Sidebar 1: Specifications

Description: Tubed stereo power amplifier, strappable for mono, with selectable output transformer taps (8, 4, or 2 ohms) and modes (Ultralinear, Triode). Tube complement: four 12AU7, four KT88 (or 6550, KT99, KT100, KT120, KT150). All measurements at 8 ohms 1 khz input voltage 127V AC. Rated power output before clipping: stereo mode, 50Wpc Ultralinear (17dBW), 25Wpc Triode (14dBW); monoblock mode, 100W Ultralinear (20dBW), 55W Triode (17.4dBW); Inputs: 1 pair unbalanced (RCA). Outputs: 2 pairs binding posts. THD at 7V RMS output: 0.08%. Power consumption: 170W idle, 585W maximum at 127V AC. Input impedance at 1kHz, stereo: 180k ohms. Triode: input voltage for maximum output at 8 ohms, 0.6V (gain: 28dB). Ultralinear mode: input voltage for maximum output, 0.5V (gain: 32dB). Input impedance at 1kHz, monoblock mode: 100k ohms. Triode mode: input voltage for maximum output, 0.6V (gain: 30dB). Ultralinear mode: input voltage for maximum output, 0.45V (gain: 35dB).
Dimensions: 17.7" (450mm) W by 8.7" (220mm) H by 13.8" (350mm) D. Weight: 67.25 lbs (30.5kg) net each; 73.85 lbs (33.5kg) shipping each.
Finish: Black, wooden side panels.
Serial numbers of units reviewed: B-50003950517, B-50003960517.
Price: $10,800/monoblock pair, $6000 each, stereo Approximate number of dealers: 5.
Manufacturer: Margules Group, Uruapan 17-4, Col. Roma Norte, Mexico DF 06700, Mexico. Tel: (52) 5514-7448. Fax: (52) 5533-4654. US: Margules Group USA, Columbus, GA. Tel: (888) 538-8605, (706) 575-0926. Web: www.margules.com.