Kencraft GA-800
¥ 29,800 (released in 1975)
Commentary
This is an integrated amplifier kit that combines high cost performance with excellent sound quality.
As a kit, each block of preamplifier, tape dubbing switch and filter switch is designed to be assembled with parts such as resistors and transistors, so the fun of making is emphasized.
Parts that require adjustment, such as the main amplifier, are mounted on a printed circuit board in advance to ensure basic performance.
All stages of the power amplifier section are directly connected pure complimentary service circuit, and the first stage is differential-amplified ± 2 power supply system.
Uses PNP and NPN power transistors with the same pair characteristics.
The equalizer amplifier section uses a differential amplifier circuit with ± 2 power supplies, and all stages are directly connected by IC.
The tone control circuit is also designed with a low distortion factor by using differential amplifier and direct-coupled IC.
A double protection circuit is mounted as a protection circuit.
The transistor is protected by a limiter protection, and the speaker is protected by a relay to prevent shock noise when the power is turned on or off.
Tape monitor circuit and tape dubbing circuit are mounted.
Equipped with two phono input terminals.
There are two speaker outputs.
Equipped with low filter and high filter.
Uses left and right independent double main volume with lock.
Equipped with a loudness control.
There is a hole for DIN connector mounting.
There was a side plate as an option sold separately.
.JPG)
Model Rating
| Type | Pre-main amplifier kit |
| Power Amplifier Unit | |
| Effective power | 38W + 38W (8 Ω, both channel operation, 20 Hz to 20 kHz) 40W + 40W (8 Ω, both channel operation, 1 kHz) 50W + 50W (4 Ω, both channel operation, 1 kHz) 45W/45W (8 Ω, single-channel operation, 1 kHz) |
| Total harmonic distortion factor | 0.5% or Less (1 khz at Effective Output) 0.03% or Less (1 kHz at Effective Output -3dB) |
| Cross modulation distortion factor | 0.5% or Less (1 khz at Effective Output) 0.03% or Less (at Effective Output -3dB) |
| Output Bandwidth Characteristics (IHF) | 15 Hz ~ 20 kHz (0.3% Distortion Factor) |
| Frequency characteristic | 8 Hz to 45 kHz + 0.5 -2dB |
| Residual noise | 0.5 mv or Less (8 Ω) |
| Damping factor | 32 (8 Ω) |
| Optimum load impedance | 4 Ω ~ 16 Ω |
| Headphone port | 4 Ω ~ 16 Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono1/2 : 2.5mV/50k Ω Aux, Tuner, Tape playA/B : 150mV/50k Ω |
| Phono maximum allowable input | 140 mv (1 khz, 0.5% distortion rate) |
| Output Level / Impedance | Tape rec:150mV |
| Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.5 dB Tuner, Aux, and Tape play : 8 hz to 45 khz + 0 to 1.5 db |
|
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
| Filter | Low filter : 80 Hz, 6dB/oct. High filter : 7 kHz, 6dB/oct. |
| Loudness control (Vol-30dB) | 100 Hz : + 8 + / - 2 dB 10 kHz : + 3 + / - 2 dB |
| S/N ratio (IHF network) | Phono : 65 dB or more Tuner, Aux, Tape play : 85 dB or more |
| <Others> | |
| Power outlet | Power switch interlock : 2 systems, 100W Power switch not linked : 1 system, 200W |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law) | 80W |
| External dimensions | Width 398x Height 136x Depth 300 mm |
| Weight | 7kg |
| Sold Separately | Sidewood GW-8S (2 Sheets 1 Set, ¥ 1,900) |