Copland CTA-506
Valve integrated amplifier from Copland, fitted with separate MM and MC phono inputs and a headphone amplifier, for enthusiasts of tube sound in a single chassis.
Description
The CTA-506 is a valve integrated amplifier designed by Copland for those who wish to enjoy tube electronics without multiplying chassis. It brings together preamplification and power stage in a single unit, while aiming for performance usually associated with separate configurations.
Its power reaches 2x 90 watts into 4 and 8 ohms, with total harmonic distortion below 1%, allowing clean operation even at sustained levels. The frequency response extends from 5 Hz to 100 kHz at -3 dB, ensuring even reproduction across the entire audible spectrum and beyond. The input sensitivity of 1.5 V at rated power and the input impedance of 100 kΩ make it easy to pair with most preamplifiers or line-level sources. The IHF-A signal-to-noise ratio of over 100 dB limits residual hiss, often a delicate point on valve amplifiers. The power stage relies on four KT120 and two 6550 valves, supported by four 12BH7 and two ECC81 for the preamplification stage.
The unit includes separate MC and MM phono inputs, monitor inputs and outputs, as well as a headphone amplifier, in addition to a balanced stereo XLR input and an unbalanced stereo RCA input. A specific start-up procedure is stated to preserve the lifespan of the valves. The power valves are visible through side perforations on the front panel.
This model is aimed at music lovers who already own a turntable fitted with an MM or MC cartridge and who are looking for a single amplifier capable of covering their entire system, without going through a separate phono preamplifier. The weight of 26 kg calls for a sufficiently sturdy and well-ventilated piece of furniture or stand, given the heat generated by the valves.
Technical specifications
| Power | 2x 90 W (4 and 8 ohms) |
| Total harmonic distortion | < 1 % |
| Frequency response | 5 Hz to 100 kHz at -3 dB |
| Input sensitivity | 1.5 V at rated power |
| Input impedance | 100 kΩ |
| Signal to noise ratio (IHF A) | > 100 dB |
| Valves | 4x KT120, 2x 6550, 4x 12BH7, 2x ECC81 |
| Weight | 26 kg |
What to check before buying used
On this type of valve integrated amplifier, check the condition of the valve set: the KT120 and 6550 in the power stage and the 12BH7 and ECC81 in the preamplification stage wear with use and may need re-matching or replacing over time. Listen carefully to the MC/MM phono channel, often the first to reveal abnormal hiss or hum. A check of the bias adjustment and a test of the protection relays are also recommended before any prolonged use.
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