COPLAND CTA301

Commentary

Tube preamplifier using a vacuum tube.

All signal switching circuits are done with palladium gold plated circuits attached to the circuit board to reasonably shorten the signal path and prevent adverse effects.
For the equalizers compatible with both MM and MC cartridges, a CR-type passive equalizer is used because of the accuracy of equalization characteristics and the naturalness of sound perception. A high-output, low-distortion SRPP circuit is used in the front stage of the equalizer in a double-triode configuration.

All power supply circuits are stabilized for each system, and film capacitors are used to prevent mutual interference, which is likely to occur in the ultra-high frequency range. In addition, the stabilization circuit includes an overload protection circuit.
Three types of cathode bypass capacitors are used in parallel : electrolytic capacitors for low frequencies, tantalum capacitors for middle frequencies, and polypropylene capacitors for high frequencies.

It uses a soft start that takes 20 seconds to reach the required DC voltage after turning on the power switch.
As a result, it is protected from excessive stress that suddenly comes in from a cold state, and it can operate reliably for a long time.

The front panel has a hairline finish of 8 mm thick machined aluminum, and the well-balanced knob also uses tapered machined aluminum.

The power cord uses a shield type Verden thick cord.

Model Rating

Type	Tube type preamplifier
Frequency characteristic	5 Hz to 100 kHz ± 1 dB 2 Hz to 200 kHz -3dB
RIAA deviation	20 Hz to 20 kHz ± 0.5 dB
Output voltage (at 47k Ω load)	Rating : 2 v Maximum : 50 V
Total harmonic distortion factor	Phono : 0.05% (2V/1kHz) or less Line : 0.01% (2V/1kHz) or less
Input sensitivity	Phono : 2.0 mV / output 2 V Line : 170 mV / output 2 V
Input impedance	Phono : 47k Ω / 120 pF Line : 75k Ω
Output impedance	2.8k Ω
Phono maximum allowable input	150mV
SN ratio (IHF / input short)	Phono:76dB Line:90dB
Input-output phase	Line : Reverse phase for all line inputs Phono : Positive phase
Vacuum tube used	Equalizer : E83cc matching pair x2 sets Line : E82ccx2 pieces
Power consumption	32W (Electrical Appliance and Material Control Law)
External dimensions	Width 430x Height 125x Depth 375
Weight	8kg