The preamp and line amp circuitry found in the B173 500 is identical to the original B173. Not a single component or design feature was compromised while converting it to a smaller package. As a result, the circuit boards are jam packed with all sorts of delicious components, including a brawny Cinemag input transformer!
The power supply is the backbone of any preamp design, and can make a huge impact on the overall sound and performance of the preamp. The +24V rail needed to power the B173 500 is painstakingly converted from the +/- 16V rails of a 500 series rack using a custom DC-DC converter circuit specially designed to keep any unwanted noise or modulations out of the signal path. Complete isolation is then achieved through the use of inductors, ferrite beads, decoupling capacitors, power regulation, and a custom enclosure surrounding the entire circuit.
The B173 500’s “Class A”, discrete circuitry combined with high-end components provide a fresh approach to a classic sound that won’t disappoint!
Features
• Cinemag Input Transformer
• Edcor Output Transformer
• 80dB Gain
• D.I. Input (active, unbalanced)
• Phantom Power
• Phase Switch
• Output Attenuator
• XLR Microphone Input
• TRS Line Output (balanced)
Specifications
Mic Section
Max Microphone Input Level: +1dBu
Input Impedance: 200Ω
Pad: None
Gain (no pad): +13dB to +80dB
Equivalent Input Noise (noise floor): -105dBu
THD+N (@ +4dBu output):
•.10% @ +9 dBu
•.12% @ +35 dBu
•.13% @ +45 dBu
•.16% @ +60 dBu
•.85% @ +76 dBu
Bandwidth (1kHz, 150Ω source, unweighted): 10Hz to 30kHz
D.I. Section
Max D.I. Input Level: +18dBu
Input Impedance: 1.1MΩ
Pad: None
Gain: Up to +25dB of gain
Equivalent Input Noise (noise floor): -100dBu
THD+N (@ +4dBu output):
•.021% @ +10 dBu
•.016% @ +20 dBu
Bandwidth (1kHz, 600Ω unbalanced source, unweighted): 10Hz to 30kHz
Output Section
Max Output Level: +28dBu
Output Impedance: 600Ω
Power Supply
• 24VAC, 500mA External Supply
Product Weight
• 3.2 lbs
Product Dimensions
• 9.5” x 6.5” x 1.75”
Shipping Weight
• 5.5 lbs
Shipping Dimensions
• 13” x 11” x 5”
