LUXMAN MQ60Custom
¥ 89,000 (around 1974)
Commentary
Tube type stereo power amplifier with non-feedback system.
The MQ60 is a negative feedback amplifier with approximately 17 dB negative feedback, but the MQ60Custom is a non-feedback amplifier without negative feedback.
The MQ60 with negative feedback has superior characteristics such as effective output, distortion factor characteristics, and frequency characteristics. However, by adopting a no-feedback system, the MQ60 realizes tones that cannot be obtained without no-feedback.
NEC's 3-pole output tube 50CA10 is used for the circuit in a push-pull system.
Equipped with an input level set function.
Model Rating
| Type | Bulb type stereo power amplifier |
| Circuit system | Nonfeedback system |
| Continuous effective output | 25W + 25W (4 ω, 8 ω, 16 ω) |
| Total harmonic distortion factor | 0.6% or less (at rated output) |
| Frequency characteristic | 20 Hz to 30 kHz ± 1 dB |
| Signal-to-noise ratio | 90 dB or more |
| Input sensitivity | 400 mv (at rated output) |
| Input impedance | 250k Ω |
| Residual noise | 0.7 mV or less |
| Damping factor | Approx. 2 (1 kHz) |
| Load impedance | 4 Ω, 8 Ω, 16 Ω |
| Attachment | Input level set Load impedance switching |
| Vacuum tube used | 50CA10x4 Pieces 12BH7Ax2 pieces 6267x2 Pieces |
| Power consumption | 250W (at rated output) |
| External dimensions | Width 410x Height 160x Depth 205 mm |
| Weight | 14kg |