PA1CC is a bipolar power amplifier of classical design working in class AB with moderate power consumption.
PA1CC consists of a differential cascode coupled input stage controlled by a current generator. The input stage
is totally discreet to optimize for linearity and bandwidth. The voltage gain stage is a current source stage,
which is differentially symmetric. The output stage is of high current gain being an easy load to the voltage gain stage.
The output stage consists of 2 pieces totally complimentary high speed power bipolar transistors.
PA1CC has short circuit protection, thermal protection and rail fuses to prevent output device break down.
PA1CC features sonic excellence, constant low output impedance, low noise, low distortion and high reliability.
The maximum power output depend on voltage supply, heat sink and load conditions. Recommendations: Voltage supply of
+ / - 50V, heat sink less than 1 K / W and minimum load of 4Ω.
Specifications:
- Maximum power output: 100W (8 Ω), 140W (4 Ω)
- 2 high speed output power transistors
- Supply voltage +/- min. 25V - max. 65V
- Distortion : <0.08%
- Frequency response: 5-150kHz (-3dB)
- Slew rate : >40V/µs
- S/N: >110dB
- Gain: 20,5dB
- Input impedance : 4kΩ
- Output impedance : <0.1Ω
- Thermal protection above 90°Celcius
- Mute control
- Weight: app. 150g
- Overall dimensions: 90mm x 80mm x 32mm
Measurments preformed by the danish audio magazine High Fidelity
The measurements were preformed with their Analog Precision measurement system.
PA1CC were powered with PSU4SA and 2 x 33V/200VA transformer (rail voltage +/-45V).
Power vs. THD+N (BW=20kHz): Blue 8Ω (100W), red 4Ω (150W).
It is not recommended to drive PA1CC at 2Ω because the protection will limit the peak power.
THD+N (BW=500kHz) vs. frequency at 50w in: 8Ω (blue) and 4Ω (red).
FFT. at 50W in 8Ω THD+N: 0,023% (BW20kHz).
Impuls current in 8Ω (blue), 4Ω (red) and 2Ω (green).
