Kenwood KA-2600 (1969)
A solid-state integrated amplifier from Kenwood’s early high-fidelity lineup. Preamp and power amp share one chassis, with low distortion and flexible signal routing.
Overview
The Kenwood KA-2600 is a stereo integrated amplifier made by Trio-Kenwood and sold around 1969. It belongs to the KA series and shares its technology with the higher-end KA-6000 and KA-4000. It was built for audiophiles of its day. The transistors are all silicon, which keeps distortion down. A tone control cancellation circuit gives flat response when the controls are set to zero. A Pre-Main jumper lets you use the preamplifier and power amplifier sections separately.
Specifications
| Rated output (Single channel, 4 Ω) | 33W |
| Rated output (Both channels, 4 Ω) | 22W |
| Music power (4 Ω, IHF) | 55W |
| Music power (8 Ω, IHF) | 70W |
| Frequency response (Power amp) | 15 Hz to 70,000 Hz ±1 dB |
| Total harmonic distortion (8 Ω, rated output) | 0.5% |
| Intermodulation distortion (8 Ω, rated output) | 0.5% |
| Input Sensitivity/Impedance (Main In) | 100mV / 100kΩ |
| Input Sensitivity/Impedance (Phono1, 2) | 2mV / 50kΩ |
| Input Sensitivity/Impedance (Tape) | 200mV / 50kΩ |
| Input Sensitivity/Impedance (MIC) | 2mV / 100kΩ |
| Input Sensitivity/Impedance (AUX, Tuner) | 200mV / 50kΩ |
| Recorded output (Tape Rec PIN) | 200mV |
| Recorded output (Tape Rec DIN) | 40mV |
| Recorded output (Dubbing) | 200mV |
| Frequency response (Preamplifier section) | 20 Hz to 30,000 Hz ±1 dB |
| Maximum Input Voltage (Phono) | 180 mV (P-P, 1 kHz) |
| Tone control (Bass) | 100 Hz ±10 dB |
| Tone control (Treble) | 10 kHz ±10 dB |
| Loudness contour | +10 dB (100 Hz), +5 dB (10 kHz) |
| Filter (Low) | 80 Hz, 6dB/oct. |
| Filter (High) | 8 kHz, 6dB/oct. |
| Equalizer accuracy | Within ±0.5 dB of RIAA |
| Signal-to-noise ratio (Phono1, 2, MIC) | 65 dB |
| Signal-to-noise ratio (Tuner, AUX, Tape Play) | 80 dB |
| Residual noise | 0.8 mV (8 Ω) |
| Damping factor | 80 (8 Ω) |
| Accessory circuits | Audio muting switch, Pre-Main jumper, DIN connector, Tape monitor, 2-speaker selector, Dubbing terminal, Power transistor protection, Stereo headphone jack, Tone control |
| Semiconductors | Transistors: 19, Diodes: 11 |
| Power supply | 100 VAC / 117 V, 50Hz/60Hz |
| Power consumption (No signal) | 15W |
| Power consumption (Maximum output) | 110W |
| Dimensions (W x H x D) | 408 x 134 x 280 mm |
| Weight | 7.5 kg |
Design
The KA-2600 uses all-silicon transistors for low distortion. It has a muting circuit and a tone control cancellation circuit, which removes the response waviness when the tone controls sit at the zero position. The preamplifier and power amplifier sections can be used independently through the Pre-Main jumper.
Context
The KA-2600 was developed with technology inherited from the Kenwood KA-6000 and KA-4000. It is part of the Kenwood KA series of integrated amplifiers and sat in the mid tier of solid-state amplifiers in the late 1960s.
Market
The KA-2600 originally sold for ¥37,500 in Japan circa 1969. Some units with channel distortion need capacitors replaced in the preamp circuit. Specific collectibility data is limited. Servicing can restore performance, and some units are offered with warranties after repair.
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