LUXKIT A3500
¥ 59,500 (released in February 1972)
Commentary
A typical tube type main amplifier kit of LUX KIT.
The output transformer adopts OY15 type which is used for SQ38FD and MQ60, etc., and an output of 40W is obtained by push-pull type ultra linear connection using 6CA7 for the output tube.
In addition, 6L6GC and 50CA10 are designed to be used for the output tube with only slight modification.
A cathode coupled circuit called a leak Mulard type is used for the driver circuit (phase inversion circuit).
This circuit has the advantage of high gain, but it has the disadvantage of unbalanced gain between upper and lower gain. The A3500 uses 6AQ8, which has high amplification, so that the unbalanced gain can be ignored even if the plate resistance is the same between upper and lower.
The A3500 has improved bare characteristics throughout the amplifier, ensuring excellent characteristics without applying negative feedback of strength.
A unique MLF circuit (multiple loop feedback circuit) is used for the negative feedback circuit to keep distortion low over the entire audible band and to maintain stability against load fluctuations.
The power supply section uses a power transformer with sufficient space to accommodate various output tubes, and the choke coil used to remove the ripple that causes the hum component is designed for A3500.
The A3500 is designed to take out the power supply for the preamp. When combined with the preamp kit A3300, it can be supplied by the connector cord.
Hood is included.
50CA10 / CR tube and kit were sold separately.
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Model Rating
| Type | Bulb type power amplifier kit | ||
| Continuous effective output |
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| Total harmonic distortion factor | 0.5% or Less (1 kHz) 1% or Less (55 Hz, 10 kHz) |
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| Frequency characteristic | 20 Hz to 20 kHz - within 1 dB | ||
| Input sensitivity | 750 mv (when 6CA7 / UL is connected) | ||
| Input impedance | 250k Ω | ||
| Signal-to-noise ratio | 90 dB or more | ||
| Residual noise | 1 mV or less | ||
| Damping factor | About 10 | ||
| Attachment | Input level set Power connector for preamplifier (A3300) |
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| Used vacuum tubes, etc. |
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| Power consumption | 250W (simultaneous operation of both channels, maximum output) | ||
| External dimensions | Width 465x Height 168x Depth 206 mm | ||
| Weight | 16kg | ||
| Attachment | Bonnet | ||
| Sold Separately | 50CA10 / CR Tube / Kit TU35 (¥ 5,900) Assembly Manual (¥ 500) |
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