COPLAND CTA 504

Second-hand. In good condition. Shows signs of use but no scratches. Complete with original packaging and manual.

The Copland CTA 504 is a tube power amplifier of Danish design, crafted to deliver an authentic and engaging musical experience rather than just a "high-fidelity" performance. This amplifier is distinguished by its effortless and natural sound, inviting listeners to immerse themselves in record after record, truly capturing the essence of the music.

Its power supply is divided into seven independent lines, each protected by high-quality capacitors. This design minimizes interference, even at high frequencies. The power section incorporates a custom-made toroidal transformer and capacitors with a wide tolerance margin, ensuring reliability and operational stability.

The amplification stage is powered by 6550A tubes and features a push-pull phase inversion circuit achieved with two Twin Triode tubes. This setup allows switching between two operational modes—pentode and triode—providing sonic flexibility to suit listener preferences.

• Triode Mode: Delivers a vibrant, intimate, and natural presentation, typical of SET amplifiers, with an enveloping musicality. This mode excels with acoustic music, offering breathtaking realism for string instruments, wind instruments, and female vocals, evoking profound emotional responses.
• Pentode Mode: Offers twice the power of the triode mode, making it ideal for electric music genres. This mode provides greater speed and impact, with drum beats, percussion, and dynamic instruments rendered with sharp precision and detail.

Combining versatility, musicality, and high-quality construction, the CTA 504 is a top choice for those seeking a refined tube amplifier.

An amplifier that blends the timeless appeal of tube sound with modern flexibility, capable of adapting to various musical genres and meeting the demands of discerning listeners.

Specifications:

• Type: Tube power amplifier
• Output power:
  • Pentode mode: 50 W + 50 W
  • Triode mode: 26 W + 26 W
• Total harmonic distortion (THD):
  • Below 0.08% (1 kHz, 1 W)
  • Below 1% (1 kHz, 50 W)
• Frequency response: 5 Hz – 65 kHz (-3 dB)
• Bandwidth: 8 Hz – 45 kHz (-3 dB)
• Signal-to-noise ratio: 100 dB (IHF, input shorted)
• Input sensitivity: 1.5 V
• Input impedance: 250 kΩ
• Output load impedance: 4 Ω or 8 Ω
• Negative feedback: 16 dB
• Phase relationship: In-phase between input and output
• Tubes used:
  • Voltage amplification and phase inversion: 5 x E83CC
  • Power amplification: 4 x 6550
• Power consumption: 185 W
• Dimensions (W x D x H): 430 x 440 x 175 mm
• Weight: 20 kg