COPLAND


COPLAND
ARCIVES



SINCE 1984



CTA506

Power amplifier





Production start: 2011


The KT120 is an impressive power valve with a long plate structure and huge grid cooling. The Copland CTA506 was among the very first audio products to utilize this new generation of valves. The driver circuits of a high power amplifier are challenged by the increase of current needed to drive the power devices of the amplifier. To prevent excessive loading of the amplifying stages of the amplifier, CTA506 employs efficient buffer circuitries as a method of partitioning the load from the amplifying valves.



CTA506 tube complement:

2 pc. ECC81.

4 pc. 12BH7

2 pc. 6550

4 pc. KT120



In order to isolate power supply fluctuations of the power stage from entering the input stages of the amplifier, the CTA506 employs active valve voltage regulation. The regulation circuitry employs two pcs. 6550 valves regulating the voltage for the amplifying and driver stage with only a fraction of deviation from the voltage chosen to operate the valves in this application.




​The CTA506 push pull output stages consists of a pair of marched KT120 in fixed ultra-linear configuration, providing the power of tetrode valves and the low distortion from triodes. A dedicated power supply for the input stages of the amplifier allows the massive central reservoir capacitors of more than 3000-microfarad to independently serve the output valves.



CTA506 Specifications:



Vacuum tubes:

KT120 x 4 / 6550 x 2 / 12BH7 x 2 / ECC81 x 2

Power output: 2 x 90 Watts

THD.: Less than 1 % at all levels

Frequency response: 5 Hz to 100 kHz - 3 dB

Input sensitivity: 1,5 V for rated power

Input impedance: 100K ohms

Overall negative feedback: 17 dB

Output taps: 8 ohms, 4 ohms.

S/N ratio ( IHF-A ) More than 100 dB

Output polarity: Non-inverting

Power consumption: 600W

Nominal mains voltage: 120V, 230V or 240V

Factory set for destination country only.

Mains voltage range: +/- 12 %

Dimensions (mm.) 430 (W) 190 (H) 390 (D)

Wight: 26 kg.


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